Unit 9 – The four operations
2 Solve these problems. Can you represent them with bar models? Make estimates first. (a) The red ribbon is 462 cm. The blue ribbon is 255 cm longer. What is the length of the blue ribbon? (b) A cup has a capacity of 292 ml. A glass has a capacity of 375 ml.
What is the total capacity of two cups and a glass?
What are the missing digits?
3
(a) H T O
(b) H T O
(c) H T O
4 3
3
4
8
+ 2
6
+ 1 5
+ 3
4
6 7 0
5 3 9
7 2 8
Try the calculations on a calculations on a calculator to check you have found the correct digits. Explain the steps you take.
E
Leon thinks that he can use what he knows about adding pairs of 3-digit numbers to help add pairs of 4-digit numbers. What do you think? Try your ideas out on the additions 2342 + 1231 and 3148 + 2327 Think about the methods you could use.
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04/05/2022 15:50
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