Developing mental arithmetic skills

Add and subtract 10s within 100.

Using bar modelling to add two numbers to make 20.

Use the number line to add three small numbers.

Finding pairs of numbers that add up to 20, and hopefully beginning to learn them.

Missing numbers to fill in to make number sentences correct.

Try working out these addition sentences using teen numbers and single digits.

Finding the missing number to make the total 20.

Add and subtract 1s using a rekenrek.