Math · Age 9 · Data & Reasoning
Choosing an Efficient Strategy (Ex. 3)
Apply and compare strategies for complex problems.
Module
Data & Reasoning
Age
Age 9
Duration
8 min
Questions
5
What's in this exercise
Answers are hidden — sign up to practise and check your work.
Question 1
Multiple choice
A shop sold 3,485 items in the morning and 2,916 in the afternoon. What is the most efficient method to find the total?
Question 2
Multiple choice
Which problem is easiest to solve mentally and why? Choose the best pair.
Question 3
Multiple choice
When is estimation alone enough?
Question 4
Sequence
Arrange by strategy needed (mental=1, written=2): 6,000−4,000=___; 6,248−4,179=___.
Question 5
True or false
A good mathematician thinks about the numbers before choosing their strategy.