CLASS 6 MATHS · WHOLE NUMBERS

Whole number properties for quick calculation

Use the distributive property a × (b + c) = a × b + a × c and clever grouping to multiply mentally.

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Worked examples

Example 1 · level 1

Find 2 × 14 × 50 in your head.

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2 × 50 = 100.
100 × 14 = 1,400.

Answer: 1,400

Example 2 · level 2

Find 17 × 38 by splitting 38 into tens and ones.

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17 × 30 = 510.
17 × 8 = 136.
Total = 646.

Answer: 646

Example 3 · level 3

Find 39 × 69 + 39 × 31 quickly.

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39 × 69 + 39 × 31 = 39 × (69 + 31)
= 39 × 100 = 3,900.

Answer: 3,900