Make a friendly multiple of ten
Rewrite 27 + 8 as 27 + 3 + 5. First reach 30, then add 5 to get 35. Splitting a number preserves its value while letting you choose a more comfortable route.
Break subtraction into steps
52 − 17 becomes 52 − 10 − 7, giving 42 − 7 = 35. Or use 52 − 20 + 3. Both preserve the original calculation. Pick the route that feels clearer to you.
Multiply in smaller chunks
14 × 6 can be split into (10 × 6) + (4 × 6). That gives 60 + 24 = 84, an application of the distributive property. Focus on checking each step rather than racing to press a button.
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