Learning to Read and Write Number Words in Grade 1

Master reading and writing number words: place value, number words, and conversion through these 3 detailed exercises.

Solution: Exercises 1 to 3
1 Number Words to Numerals
Exercise 1
Write the numeral for each number word:
a) forty-three
b) seventy-eight
c) one hundred five
Definition:

Number words to numerals: Converting written number words into numeric form (digits).

Conversion method:
  1. Identify the number word parts (hundreds, tens, ones)
  2. Convert each part to digits
  3. Combine the digits in the correct order
a) forty-three
43
b) seventy-eight
78
c) one hundred five
105
Step 1: Break down "forty-three"

"forty" = 4 tens (40), "three" = 3 ones (3)

Step 2: Combine the parts

40 + 3 = 43

Step 3: Apply to other examples

Seventy-eight: 70 + 8 = 78

One hundred five: 100 + 0 + 5 = 105

a) forty-three = 43
b) seventy-eight = 78
c) one hundred five = 105
Final answer:

a) 43, b) 78, c) 105

Applied rules:

• Hyphenated compounds: Words connected by hyphens represent tens and ones (thirty-one = 31)

• "Ty" ending: Indicates multiples of ten (forty = 40, seventy = 70)

• "Hundred" rule: "One hundred" means 100, followed by tens and ones

Number Word Parts Numerical Form
forty-three forty + three 40 + 3 = 43
seventy-eight seventy + eight 70 + 8 = 78
one hundred five one hundred + five 100 + 0 + 5 = 105
2 Numerals to Number Words
Exercise 2
Write the number word for each numeral:
a) 56
b) 89
c) 112
Definition:

Numerals to number words: Converting numeric form (digits) into written number words.

a) 56
fifty-six
b) 89
eighty-nine
c) 112
one hundred twelve
Step 1: Identify place values for 56

5 is in tens place (fifty), 6 is in ones place (six)

Step 2: Combine with hyphen

fifty + six = fifty-six

Step 3: Apply to other examples

89: eighty + nine = eighty-nine

112: one hundred + twelve = one hundred twelve

a) 56 = fifty-six
b) 89 = eighty-nine
c) 112 = one hundred twelve
Final answer:

a) fifty-six, b) eighty-nine, c) one hundred twelve

Applied rules:

• Hyphenation rule: Use hyphens for compound numbers 21-99 (twenty-one, thirty-five)

• Special teens: Numbers 11-19 have unique names (eleven, twelve, thirteen...)

• Hundreds pattern: "One hundred" + number word for remaining digits

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120
3 Mixed Practice
Exercise 3
Complete the conversions:
a) 34 = _______
b) ninety-one = _______
c) 107 = _______
d) one hundred eighteen = _______
Definition:

Mixed conversions: Practicing both directions of number word and numeral conversion.

a) 34
thirty-four
b) ninety-one
91
c) 107
one hundred seven
d) one hundred eighteen
118
Step 1: Convert 34 to words

3 tens (thirty) + 4 ones (four) = thirty-four

Step 2: Convert ninety-one to numeral

ninety = 90, one = 1, so 90 + 1 = 91

Step 3: Convert 107 to words

1 hundred (one hundred) + 0 tens (zero) + 7 ones (seven) = one hundred seven

Step 4: Convert one hundred eighteen to numeral

one hundred = 100, eighteen = 18, so 100 + 18 = 118

a) 34 = thirty-four
b) ninety-one = 91
c) 107 = one hundred seven
d) one hundred eighteen = 118
Final answer:

a) thirty-four, b) 91, c) one hundred seven, d) 118

Applied rules:

• Place value: Each position has a specific value (hundreds, tens, ones)

• Zero placeholder: Even zeros have a place value

• Hyphenation: Compound numbers use hyphens (thirty-four)

• Special cases: Numbers 11-19 have unique names

HUNDREDS
1
= 100
TENS
1
= 10
ONES
8
= 8

Complete Summary: Reading and Writing Number Words

Key Concepts and Definitions

Number Words: Writing numbers using letters instead of digits (like "twenty-five" instead of "25")

Numerals: The regular way we write numbers using digits (like 45, 123)

Place Value: The value of a digit based on its position in a number (ones, tens, hundreds)

Tens Words: Special words for multiples of ten (ten, twenty, thirty, forty, etc.)

Ones Words: Words for single digits (one, two, three, four, etc.)

Teen Numbers: Numbers 11-19 with special names (eleven, twelve, thirteen, etc.)

Compound Numbers: Numbers made of tens and ones (twenty-one, thirty-five, etc.)

Core Rules and Principles

• Hyphenation Rule: Compound numbers 21-99 use hyphens (twenty-one, thirty-five)

• Teen Rule: Numbers 11-19 have unique names (eleven, twelve, thirteen...)

• "Ty" Rule: Words ending in "ty" indicate multiples of ten (thirty = 30, forty = 40)

• Hundreds Rule: "One hundred" + number word for remaining digits

• Order Rule: Read from highest place value to lowest (hundreds, then tens, then ones)

Step-by-Step Methods

For Numerals to Number Words:

  1. Identify the place value of each digit
  2. Convert each digit to its word form
  3. Combine using proper hyphenation rules
  4. Remember special names for 11-19

For Number Words to Numerals:

  1. Break the word into parts (hundreds, tens, ones)
  2. Convert each part to digits
  3. Combine the digits in the correct order
  4. Pay attention to hyphenated compound words

For Verification:

  1. Read your answer aloud to check if it matches the original
  2. Count the digits to match the place value
  3. Compare with known examples
Examples (Simple to Advanced)

Simple Examples:

• 5 = five

• 12 = twelve

• 20 = twenty

Intermediate Examples:

• 34 = thirty-four

• 87 = eighty-seven

• 99 = ninety-nine

Advanced Examples:

• 103 = one hundred three

• 115 = one hundred fifteen

• 120 = one hundred twenty

Tips, Tricks, and Common Pitfalls

Tips:

• Practice saying numbers aloud to build familiarity

• Remember that "teen" numbers (11-19) have unique names

• Use hyphens for compound numbers (thirty-one, not thirty one)

• Think of "ty" numbers as groups of tens (thirty = 3 tens = 30)

Common Mistakes:

• Forgetting hyphens in compound numbers (writing "thirty one" instead of "thirty-one")

• Confusing teen numbers (thinking 15 is "fiveteen" instead of "fifteen")

• Misplacing zeros in hundreds (writing "one hundred and three" instead of "one hundred three")

• Reversing the order (writing "five thirty" instead of "thirty-five")

Key Notes for Memorization

• Memorize special cases: 11-19 have unique names (eleven, twelve, thirteen...)

• Learn the "ty" pattern: twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety

• Remember "one hundred": Always starts with "one hundred" followed by the rest

• Practice daily: Regular exposure builds fluency

• Use visual aids: Charts and flashcards help with memorization

Rules and Methods for Number Words
87 = eighty-seven
Number Word Conversion
Ones
one, two, three...
1-9
Tens
ten, twenty, thirty...
10-90
Teens
eleven, twelve, thirteen...
11-19
Key definitions:

Number words: Writing numbers using letters instead of digits

Hyphenation: Using "-" to connect tens and ones in compound numbers

Place value: The value of a digit based on its position

Conversion methodology:
  1. Identify place values: Recognize hundreds, tens, and ones places
  2. Match to words: Convert each digit to its corresponding word
  3. Apply grammar rules: Use hyphens for compound numbers
  4. Verify accuracy: Check that your answer matches the original number
Tip 1: Remember "teen" numbers are special: eleven, twelve, thirteen...
Tip 2: Use hyphens for numbers 21-99 when both tens and ones are present.
Tip 3: Think of "ty" numbers as groups of tens (thirty = 3 tens = 30).
Tip 4: For hundreds, always start with "one hundred" then continue.
Common errors: Forgetting hyphens, misreading teen numbers, confusing tens and ones.
Practice strategies: Read numbers aloud, write them in both forms, use number lines.
Rules to know:

• Hyphenation rule: Use hyphens for compound numbers 21-99 (twenty-one)

• Teen numbers: 11-19 have special names (eleven, twelve, thirteen...)

• Zero placeholder: Even if a place has 0, include it in expanded form

• Hundreds pattern: "One hundred" + remaining digits

Number Word Patterns and Practice
120 = one hundred twenty
Number Word Pattern
Understanding Number Word Patterns:

Ones pattern: one, two, three, four, five, six, seven, eight, nine

Tens pattern: ten, twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety

Teens pattern: eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen

Compound pattern: tens + hyphen + ones (twenty-one, thirty-five, etc.)

Reading Strategies:
  1. Look at the number of digits: 1-digit, 2-digit, or 3-digit
  2. Identify place values: Hundreds, tens, ones
  3. Read from left to right: Start with the highest place value
  4. Combine parts: Read each group correctly
Pattern Recognition: Notice that "ty" numbers end in multiples of ten.
Memory Aid: Think of "teen" as "ten plus" (thirteen = ten + three).
Visual Help: Draw number lines to connect numerals to words.
Number Relationships: Each number word corresponds to exactly one numeral.
Consistent patterns: Once you learn the patterns, they apply to all numbers.
Important Patterns:

• Teen numbers: 11-19 (eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen)

• Ty numbers: 20, 30, 40, 50, 60, 70, 80, 90

• Compound numbers: Use hyphens (twenty-one, thirty-five, etc.)

• Hundreds: One hundred, one hundred one, one hundred two, ..., one hundred twenty

Practice Problems and Solutions
113 = one hundred thirteen
Example Problem
Practice Problems:

Problem 1: Write "fifty-nine" as a numeral.

Problem 2: Write 74 as a number word.

Problem 3: Write "one hundred sixteen" as a numeral.

Problem 4: Write 108 as a number word.

Solution Approach:
  1. For number words to numerals: Identify each part and convert to digits
  2. For numerals to number words: Break into hundreds, tens, and ones
  3. Apply proper grammar: Use hyphens for compound numbers
  4. Verify: Check that your answer matches the original
Tip 1: Practice reading numbers aloud to build fluency.
Tip 2: Use a number line to visualize the relationship between numerals and words.
Tip 3: Group numbers in tens to understand place value better.
Tip 4: Read number words aloud to reinforce the connection between digits and words.
Assessment Focus: Teachers often test understanding of number word conversions.
Real-world Application: These skills help with reading clocks, money, and measurements.
Practice Solutions:

• Fifty-nine: 59

• 74: seventy-four

• One hundred sixteen: 116

• 108: one hundred eight

Questions & Answers

Question: Why is it "eleven" and "twelve" instead of "oneteen" and "twoteen"? The other numbers like 13, 14, 15 all have "teen" at the end.

Answer: That's a great observation! "Eleven" and "twelve" are special because they come from old English words. They were named differently long ago, and we still use those old names today. Here's the history:

  • "Eleven" comes from the old English word "endleofan" which meant "one left over" (after counting to ten)
  • "Twelve" comes from "twelf" which meant "two left over" (after counting to ten)
  • Starting with 13, the pattern became more consistent: "thir" (three) + "teen" (ten more) = thirteen

Even though the names are different, "eleven" and "twelve" still mean "ten plus one" and "ten plus two". It's just that we kept the older names for these two numbers.

It's like how some animals have unusual plural forms - we say "mouse" and "mice" instead of "mouses", just because of historical reasons.

Question: My child keeps forgetting to use hyphens when writing compound numbers like "thirty one" instead of "thirty-one". How can I help them remember?

Answer: This is a very common mistake! Here are some helpful strategies:

  • Visual cues: Show them that compound numbers are "glued together" with a hyphen
  • Memory trick: "Hyphens hold the tens and ones together" - like a bridge connecting them
  • Practice with games: Have them read numbers aloud and clap when they say compound numbers
  • Reference chart: Keep a chart visible showing correct hyphenation

You can also explain that when we say these numbers out loud, we say them as one word ("thirty-one", not "thirty one"), so the hyphen shows that on paper too.

Remember: All numbers from 21 to 99 that have both tens and ones parts need hyphens (twenty-one, thirty-five, forty-three, etc.).

Question: When I write "one hundred" and then have more numbers, do I put "and" between them? Like "one hundred and three" or "one hundred three"?

Answer: Great question! For whole numbers like 103, we usually write "one hundred three" WITHOUT "and". We only use "and" when we have decimal numbers (numbers with parts smaller than one).

  • Correct: "one hundred three" (103)
  • Correct: "one hundred twenty" (120)
  • Correct with "and": "one hundred three AND five tenths" (103.5)

Think of it this way: "and" is like a special word that separates the whole number part from the fraction part. Since 103 is just a whole number, we don't need "and".

But don't worry too much - both ways are understood, but in math class, teachers usually prefer "one hundred three" without the "and" for whole numbers.