L.I:Use x 10 to multiply by 9 or multiply by 11
Today Mrs Raj tough me how to multiply by 10 if you didn't know your 9's. It would be easier to use your 10 x's to help with your maths problems.
(you guys might know the answer but its a demo)
Eg:
5 x 9=
5 x 10= 50 -5= 45
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