Page 29 - 新思维数学学生用书7 样章

1 Integers

Check your progress

1 Work out:

a 3 − 7 b −3 + −7
c −2 × (2 − −4) d (−9 + −6) ÷ 3
2 a Find two integers that add up to 2 and multiply to make −15.
b Find two integers that add up to 3 and multiply to make −70.

3 Find the missing numbers.
a 5 × = −8 − 7 b −12 ÷ = 4 + −6
4 Find all the common factors of 16 and 24.
5 a Find all the multiples of 6 between 50 and 70.

b Find the lowest common multiple of 6 and 15.
6 a Find the highest common factor of 26 and 65.

b Simplify the fraction 26 .
65
7 The integer N is less than 100. N and N are both integers.
3
a Explain why N must be a square number.
b Find the value of N.
8 The number 96*32 has a digit missing.

a Explain why the number is divisible by 4.
b Find the missing digit if the number is divisible by 3.
c Find the missing digit if the number is divisible by 11.

9 Copy and complete the following.
1 = 1 2
3
4 = 8 2
3
3 = 2
16 = 2
3

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