Math · Age 9 · Data & Reasoning
Explaining How an Answer Was Found (Ex. 2)
Evaluate mathematical explanations and reasoning.
Module
Data & Reasoning
Age
Age 9
Duration
8 min
Questions
5
What's in this exercise
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Question 1
Multiple choice
Maria says: 'I rounded 4,587 to 5,000 and 2,312 to 2,000 to estimate 7,000.' Is her method correct?
Question 2
Multiple choice
Tom found 6,000 − 2,500 = 3,500 by counting up from 2,500 to 6,000. Which explanation best describes his method?
Question 3
Multiple choice
Which is the clearest explanation of how to solve 3,845 + 2,155?
Question 4
Sequence
Explain 4,000 + 500 + 30 + 2: thousands = 4,000; hundreds = 500; tens = ___; ones = 2.
Question 5
True or false
Good mathematical explanations should show your working step by step.