Page 16 - 新思维数学活动用书2 样章
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1.2 Counting up to 100 objects
Worked example 2
More than 10,
Arun scoops some stones out of a tray. but fewer than 50.
How many stones does he scoop out? I estimate 20.
Estimate then count.
Estimate
10 20 50 100
Count
Count in tens:
10, 20. Count on in
ones: 21, 22, 23, 24, 25,
26, 27.
Answer: 27 stones
15
