Number bonds

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Number bonds are easy when you follow what's above.

72 + ?=100
2+8=10
and then 70 + 20=90
so 10+90=100
The ones column should equal 10 and  the tens Column must equal 9
Challenge your mum and dad see who can work this number out the fastest.

Try this number 35+  ?=100


Try your own number bonds.
Will this strategy work with numbers like  347+ ? =1000.