Page 7 - 新思维数学活动用书6 样章
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1 The number system
1.1 Place value
Worked example 1
compose numbers decimal point
Paulo is thinking of a number. decompose digit hundredth
He says, ‘If I divide my number place value regroup tenth
by 10 and then by 100, the answer thousandth
is 0.375.’
What number is Paulo thinking of?
0.375 × 100 × 10 To find Paulo’s number, reverse
the operations.
100 10 1 0.1 0.01 0.001
You could replace × 100 × 10
0 3 7 5 by × 1000.
0 3 7 5 × 100
3 7 5 × 10
0.375 × 100 × 10 = 375
Answer: Paulo is thinking of 375.
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