Search Results For “missing numbers”

Four tricky pages on estimating where whole numbers lie on a blank number line.

What numbers come next to carry on the pattern of counting on?

Clever tricks to add 9 quickly to any 2-digit number.

Four bright, colourful worksheets on adding 2-digit numbers to multiples of ten.

All these numbers are multiples of 5. Just link into pairs to make each pair add up to 100.

Sometimes it's easier to do subtraction by counting up, especially if the numbers are close to each other.

Mini investigations into how many different ways totals can be made from three numbers.

Subtracting 2-digit numbers, but no 'decomposition' needed. A good mental arithmetic exercise.

practice at subtracting 11 or 21 from 2-digit numbers 'in your head'.

Let's look at the patterns of numbers created when adding.