Posted by Peter on 12th May 2010

Resource of the week: adding 29, 39 etc


Once children are really secure and confident with adding 9 to a 2-digit number they can quickly catch on to how to add 19, 29 etc.  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

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