Question 1 • Grade 7 Mathematics
Using the distributive property, split 144 into friendlier addends: 144 = 100 + 40 + 4. Then 17 × 144 = 17 × (100 + 40 + 4) = 17 × 100 + 17 × 40 + 17 × 4. So the expression 17 times 100 plus 17 times 40 plus 17 times 4 is a valid step.
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