Page 17 - 新思维数学学生用书5 样章

1 The number system

7 Use the clues to identify the correct number.

10.42 9.73 9.9 9.37

7.83 10.1 8.7 9.55

The number:

• has no hundredths digit
• has a tenths digit which is odd

• rounds to 10 to the nearest whole number
• is less than 10.

Swap books with your partner and check their answers.

Think about the questions you have just answered. If you were asked
similar questions, what would you do differently?

Think like a mathematician

Roll a dice twice and make a number with 1 decimal place.

Find all the different numbers you can make.

Round each of your numbers to the nearest whole number.

2.5 rounds to 3
5.2 rounds to 5

Roll the dice again and make some more numbers.

What numbers with 1 decimal place are possible?
Find all the possible numbers these could round to.

Look what I can do!

I can round numbers with 1 decimal place to the nearest whole number.

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