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12 cards from this deck
Method to find an approximate answer to a calculation
Approximately equal to
1 significant figure
4×20=804 \times 20 = 804×20=80
3002=90,000300^2 = 90,0003002=90,000
Multiply both numbers by same amount, answer stays same
140,000÷5=28,000140,000 \div 5 = 28,000140,000÷5=28,000
43×103=64×1000=64,0004^3 \times 10^3 = 64 \times 1000 = 64,00043×103=64×1000=64,000
Estimated answer smaller than true answer
Estimated answer larger than true answer
3
Round each number to 1 significant figure
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