Solve comparison and change problems using division
I can solve comparison and change problems using division.
Solve comparison and change problems using division
I can solve comparison and change problems using division.
Lesson details
Key learning points
- A change in length can be described using division.
- Division can be represented as multiplication by a unit fraction.
- The stem sentence, 'The ___ is ___ times the length of the ___' can be used to support understanding.
- Comparison and change problems can be represented visually to support understanding.
Common misconception
Children may say 'ten times shorter' which is imprecise. Children are more familiar with multiplication resulting in an increase, and need to appreciate that it can also result in a decrease.
We say, 'ten times the original height' because this is more precise especially when the scale factor is fractional. When we multiply by a unit fraction, it is the same as dividing the whole by the denominator. This results in a decrease in length.
Keywords
Comparison - When a comparison is made, we are determining how different two objects are. In this case, how many times longer, taller or deeper an object is than another.
Change - A comparison can also be made between an object before, and then after, a change. Examples of a change include a change in height of a flower due to growth.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
6 Questions
Exit quiz
6 Questions
Dog is 24 cm tall. -
Sunflower is 96 cm tall.
Dog is 45 cm tall. -
Sunflower is 180 cm tall.
Dog is 19 cm tall. -
Sunflower is 76 cm tall.
Dog is 25 cm tall. -
Sunflower is 100 cm tall.
Dog is 51 cm tall. -
Sunflower is 204 cm tall.