9.06 Story problems with mass and volume
Are you ready?
Remembering how to measure and estimate mass and volume will help you solve problems in this lesson. Let's give this problem a try.
Which unit is best to measure the mass of this cup of flour?
Kilograms
AGrams
B
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When we are solving story problems about measuring and estimating mass and volume, there are certain words which help us to decide which operations to use. Let's see if we can find some clues for addition and subtraction in this video.
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Question 1
Irene buys a $5$5 kg bag of rice, and uses $1$1 kg that evening.
How much rice is left?
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Let's see if we can find some clues for multiplication and division in this video.
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Question 2
A wheelbarrow is being used to carry tiles from one side of the yard to the other. $8$8 tiles, which each have a mass of $10$10 kg, are put in the wheelbarrow.
What is the total mass of tiles in the wheelbarrow?
When we have a word problem, we need to think about the story and use the keywords to work out which operators to use. Some words that we may find in a story could be:
| addition | subtraction | multiplication | division |
|---|---|---|---|
| more | less | times | divide |
| add | subtract | multiply | split |
| give to | take away | product of | out of |
| plus | minus | per | evenly |
Can you think of other words to use for addition, subtraction, multiplication, and division?