The next stage in subtraction is to take away a jump of ten. Your child needs to have a secure understanding of place value to subtract one ten mentally.
They need to understand that only the tens digit is changed.
e.g. 37 – 10 = 27
The tens column has become less by one ten while the units have stayed the same. This mental strategy is vital and any opportunity you have to practice adding and subtracting tens would be very beneficial.
To help them understand this concept we begin our sum on the right hand side on the number line and jump backwards to reinforce the concept of numbers getting smaller.
To practice this written strategy please watch the clip below.