Page 16 - Maths 1
P. 16
χ
c) - 7 = 12 add 7 to both sides the equation
4
x
- 7 + 7 = 12 + 7
4
x
+ 0 = 19 multiply both sides by 4
4
x
x 4 = 19 x 4
4
= 76 [3]
χ−7
d) = 12 multiply both sides by 4 of the equation
4
x−7
x 4 = 12 x 4
4
- 7 = 48 add 7 to both sides
- 7 + 7 = 48 + 7
= 55 [3]
4. a) A prime number is divisible by itself and 1. So they a
11, 13, 17, 19 [1]
b) Count in 15’s for multiples of 15. So the first 3 multiples are:
15, 30, 45 [1]
c) Factors of a number are the numbers that divide the number in
question equally. So for 49, they are :
1, 7, 49 [1]