For this worksheet, it will be useful for you to know the square numbers off by heart.
12 = 1
22 = 4
32 = 9
42 = 16
52 = 25
62 = 36
72 = 49
82 = 64
92 = 81
102 = 100
112 = 121
122 = 144
It's also useful to know that 152 = 225
Example
Work out the following mentally.
| 52 + 10 = |
|
This activity contains 10 questions
