Length: How long or short something is, measured in centimeters (cm), inches (in), feet (ft), etc.
- Read the problem carefully
- Find what you know (given information)
- Find what you need to find (the question)
- Decide what operation to use (addition or subtraction)
- Solve the problem
- Write the answer with the correct unit
Tom's pencil: 15 cm
Friend's pencil: 8 cm
How much longer Tom's pencil is
We need to find the difference, so we subtract
Longer - Shorter = Difference
15 cm - 8 cm = 7 cm
Tom's pencil is 7 centimeters longer.
Tom's pencil is 7 centimeters longer than his friend's pencil.
• Comparison: Longer - Shorter = Difference
• Same units: Both measurements must be in the same unit
• Subtraction: Use subtraction for "how much more/less"
Total Length: When we add lengths together, we find the combined or total length.
Red ribbon: 12 inches
Blue ribbon: 9 inches
Total length of both ribbons
We need to combine lengths, so we add
12 inches + 9 inches = 21 inches
The total length is 21 inches.
The total length of both ribbons is 21 inches.
• Addition: Use addition for "total," "combined," or "altogether"
• Same units: Both measurements must be in the same unit
• Combining: Adding lengths gives the total length
Multi-step problems: Problems that require more than one operation to solve.
Original string: 25 centimeters
After cutting: 25 cm - 10 cm = 15 cm
After adding: 15 cm + 7 cm = 22 cm
The string is now 22 centimeters long.
The string is now 22 centimeters long.
• Order matters: Follow the sequence of events in the problem
• Multiple operations: May need both addition and subtraction
• Step-by-step: Solve one operation at a time
• Read: Read the problem carefully
• Find: Find what you know and what you need to find
• Plan: Plan which operation to use
• Solve: Solve the problem step by step
• Check: Check if your answer makes sense
Weight: How heavy something is, measured in pounds (lb), ounces (oz), or grams (g).
First bag: 6 pounds
Second bag: 4 pounds
Total weight of both bags
We need to find the total, so we add
6 pounds + 4 pounds = 10 pounds
Both bags weigh 10 pounds together.
Both bags weigh 10 pounds together.
• Addition: Use addition to find total weight
• Same units: Both measurements must be in the same unit
• Combined weight: Adding weights gives total weight
Capacity: How much liquid a container can hold, measured in cups, pints, quarts, or gallons.
Jug holds: 3 cups
Pitcher holds: 5 cups
How many more cups the pitcher holds
We need to find the difference, so we subtract
Bigger - Smaller = Difference
5 cups - 3 cups = 2 cups
The pitcher holds 2 more cups than the jug.
The pitcher holds 2 more cups than the jug.
• Comparison: Use subtraction to find "how many more"
• Same units: Both measurements must be in the same unit
• Difference: Larger minus smaller gives the difference
Length: Distance from one end to another, measured in centimeters, inches, feet, etc.
Weight: How heavy something is, measured in pounds, ounces, or grams.
Capacity: How much liquid a container can hold, measured in cups, pints, quarts.
Time: Duration or moment, measured in seconds, minutes, hours.
- Read carefully: Understand what the problem is asking
- Identify units: Notice what units are being used
- Find key words: Look for words like "more," "less," "total," "together"
- Plan operations: Decide whether to add or subtract
- Calculate: Perform the math operations
- Check answer: Verify the answer makes sense
• Length: 1 foot = 12 inches, 1 yard = 3 feet
• Weight: 1 pound = 16 ounces
• Capacity: 1 pint = 2 cups, 1 quart = 2 pints, 1 gallon = 4 quarts
• Time: 1 hour = 60 minutes, 1 minute = 60 seconds