Find How Much Longer in the Same Unit
Write both supplied lengths with matching unit labels.
About 15 minutes, plus any extended practice
Supplied materials
- Paper and a pencil; drawing and spoken explanations are welcome. An adult may read directions and options aloud.
- Supplied worked-case record: A ribbon is 36 cm and a strip is 24 cm.
- All quantities and shape descriptions are supplied in the worked example and questions; no purchase or personal information is needed.
Learn the idea
A length comparison asks for the extra distance beyond the shorter object. The two measurements must use the same unit. Align the objects at one end and subtract the shorter length from the longer. Adding would find their combined length instead.
Write both supplied lengths with matching unit labels. Subtract the smaller from the larger and explain the result as how much longer. Add the difference back to the shorter length to check the longer measurement.
Write centimeters beside both inputs and the result. How much longer requests a difference, not a combined length. Draw two aligned length bars and bracket only the extra section.
- Draw two aligned length bars and bracket only the extra section.
- Follow the worked example. Point to each number or shape feature and say what it tells you.
- Write both supplied lengths with matching unit labels.
- Try the question and then the three practice questions. Check your answers and explain any change you make.
See the method in action
A ribbon is 36 cm and a strip is 24 cm. The ribbon is 36−24=12 cm longer. A model from the same start has a twelve-centimeter part beyond the shorter strip. Check 24+12=36; the comparison is not their combined sixty-centimeter length. Write centimeters beside both inputs and the result. How much longer requests a difference, not a combined length. Draw two aligned length bars and bracket only the extra section.
Check your reasoning
Your answer is temporary and is not saved to an account. Download your current answer before leaving or reloading. Written work on paper or in another app stays in your own file.
Helpful tips
- Write centimeters beside both inputs and the result.
- How much longer requests a difference, not a combined length.
See the answer and explanation
13
Subtract lengths measured in the same unit. The result is 13.
Take it further
Compare 58 cm and 39 cm. Expected: 19 cm longer.
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More practice: try new cases
Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.
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Check the subject sources
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