We have been using our knowledge of number bonds to 10 to solve number bonds to 100 with multiples of 10.
If I know 3+7 = 10, I know 30 + 70 = 100.
Play these games to reinforce this knowledge.
http://www.snappymaths.com/addition/make100m10/interactive/make100m10imin/make100m10imin.htm
https://www.topmarks.co.uk/maths-games/hit-the-button
Choose Number Bonds, then Make 100 (tens)
There are also number bonds to 10 and 20 which would be useful revision.
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White Rose Maths
Autumn-Block-2-Addition-and-subtraction
Spring-Block-3-Properties-of-shape
Spring-Block-5-Length-and-height
Year 2 | White Rose Maths website link