Page 27 - 新思维数学学生用书6 样章
P. 27
2 Numbers and sequences
Exercise 2.2
1 What is the ninth square number?
2 Calculate.
a 5 2 b 10 2 c 7 2
3 Find two square numbers that total 45 when added together.
4 Here are three cubes of increasing size.
A B C
How many small cubes are in each of the large cubes?
Tip
In cube A: There are 2 small cubes along each edge.
There are 4 or 2 small cubes in each layer.
2
There are 8 or 2 × 2 or 2 small cubes in cube A.
2
3
5 Calculate.
a 5 3 b 1 3 c 3 3
Check your answers to questions 4 and 5 with your partner.
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