Difference using a marked number line
Count on from the smaller number to the larger. As numbers are added to the balance scale they are also shown on the number line. Children should be encouraged to use their knowledge of number bonds to develop efficient mental methods.
Levels include counting up to 10, 20, 50 or 100, finding the difference between 2-digit numbers and decimals.
New Maths Curriculum:
Year 2: Add and subtract numbers using concrete objects, pictorial representations, and mentally, including: a two-digit number and ones; a two-digit number and tens; two two-digit numbers;adding three one-digit numbers
KS2 Primary Framework:
Children use their knowledge of number pairs for 10 and 20 to add and subtract efficiently (Block A)
Use efficient written methods to add and subtract whole numbers and decimals with up to two places.