Math · Age 11 · Addition & Subtraction
Estimation & Checking Answers (Ex. 3)
Apply estimation and inverse operations to multi-step calculation problems.
Module
Addition & Subtraction
Age
Age 11
Duration
10 min
Questions
5
What's in this exercise
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Question 1
Multiple choice
A school raised £8,456,780 and spent £5,234,560. Estimate the remaining amount (round to nearest million).
Question 2
Multiple choice
A student calculates 9,876,543 + 1,234,567 = 11,111,110. The estimate (rounded to millions) is 10M + 1M = 11M. What does this tell you?
Question 3
Multiple choice
To verify 15,000,000 − 6,543,210 = 8,456,790, calculate:
Question 4
Sequence
Estimate then fill: 4,890,000 ≈ 5M; 3,120,000 ≈ 3M; estimate of sum = ___M; exact = 8,010,000.
Question 5
True or false
An estimate that is far from the calculated answer is a warning sign that there may be an error.