Page 15 - 新思维数学活动用书5 样章
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1 The number system
9 Here are eight numbers.
19.4 19.9 21.1 20.4 20.3 19.7 21.4 10.1
Draw a ring round the number that these clues are describing.
• The number rounds to 20 to the nearest whole number.
• The tenths digit is odd.
• The sum of the digits is less than 18.
• The tens digit is even.
10 Rashid has these number cards.
1.4 2.4 3.4 4.4
He chooses two cards.
He adds the numbers on the cards together.
He rounds the result to the nearest whole number.
His answer is 7.
Which two cards did he choose?
and .
11 Arun rounds these numbers to the nearest whole number.
3.3 3.5 3.7 3.9 4.4 4.5 4.9
He sorts them into 3 groups and places them in a table.
Complete the table.
Rounds to Rounds to Rounds to
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