Tag: add

Here we continue with our mental arithmetic series on addition by looking at adding 29, 39 and 49 to 2-digit numbers. Make sure that your child is confident with adding 9 before going on to these. Once again the process is the same: add the nearest whole ten and then subtract 1. Once this has been mastered similar techniques can be used to add 2-digit numbers that have 8 in the units, subtracting two rather than one, which makes adding any 2-digit numbers fairly straightforward!

This page, and many others, can be found in our Year 4 maths worksheets under Knowing Number Facts.

Add 29, 39, 49 to any 2-digit numbers

By year 4 children should be comfortable with 2-digit addition ‘in their heads’. This maths worksheet on adding 19 to any 2-digit number will show whether they are confident and quick with their mental methods.

There are usually two processes involved when adding 19. It is often best done by adding twenty and subtracting one, although some children may well add ten and then add 9. This is easier and quicker  than writing the sum down in columns and adding up using the standard method.

Add 19 to any 2-digit number