Page 15 - 新思维数学活动用书6 样章
P. 15
1 The number system
4 Complete the table.
Number rounded to the Number rounded to the nearest
Number
nearest tenth whole number
3.78
4.45
3.55
4.04
Practice
5 Circle the largest number from the list that gives 100 when rounded to the nearest
whole number.
100.55 99.99 100.9 100.45
100.5 99.5 99.9
6 Use each of the digits 9, 4, 1 and 2 once to make the decimal number closest to 20.
7 Pedro has four number cards.
0.45 1.45 2.45 3.45
He chooses two cards.
He adds the numbers on the cards together.
He rounds the result to the nearest whole number.
His answer is 5.
Which two cards did he choose?
and
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