Mental Math

Square Numbers 10 to 120

To square a number you multiply it by itself. Children will learn the square numbers as they learn their times tables (they are highlighted in red in the table below), however it is important to focus a little on these special numbers and for children to recognise if a number e.g. 16 or 81 is a square number.

In these worksheets the squaring of the numbers 10, 20, 30, 40...110, 120 is practised with a mixture of different question formats:

Multiplication - H00 x T0 or H00 Worksheets

n these worksheets a 3-digit factor of 100 is multiplied by a 2-digit factor of 10 or a 3-digit factor of 100. As with the easier Multiplication T0 x T0 Worksheets, and having learned their times tables, the only difficulty children will have is getting the correct number of zeroes in the answer.

Division - HTU or THTU by TU Worksheets

In these worksheets 3- or 4-digit factors of 100 are to be divided by a 2-digit factor of 10 resulting in a whole number answer.
Though they look complicated at first glance, a good memory of the times tables and an understanding of how they can be inverted - i.e. 3x4=12, so 12÷3=4 and 12÷4=3, leaves the child just needing to concentrate on getting the correct number of zeroes in the answer.

Find the Middle Number - 3 digits Worksheets

In these worksheets the child has to work out the number in the middle of the two supplied three-digit values.

Doubling Numbers from 50-99 Worksheets

In these worksheets children will double numbers ranging from 50 to 99, with the questions asked in a mixture of formats: