Page 9 - 新思维数学学生用书6 样章

1 The number system

Getting started

1 What is the value of the digit 9 in these numbers?
a 809.46 b 2021.89 c 123 456.95

2 Write these numbers in words and digits.
a 200 000 + 5000 + 400 + 8 + 0.9

b 500 000 + 70 000 + 30 + 6 + 0.01
3 a What number is ten times bigger than 0.01?

b What number is one hundred times smaller than 555?

4 What is the missing number?
100 × 10 = 10 000 ÷

5 Round these lengths to the nearest whole number.

a 6.2 m b 36.5 cm c 12.3 m d 10.6 cm
6 A number with 1 decimal place is rounded to the nearest whole number.

a What is the smallest number that rounds to 100?
b What is the largest number that rounds to 10?

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