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Learn how column addition can be used to make adding numbers easier. Addition and subtraction methods Learn about efficient addition and subtraction methods. Add 3-digit and 2-digit numbers Learn ...

We can put 4 things in one ... 12 - 5 = 7 Just like with addition, we can use a part-whole model to help partition larger numbers to make them easier to deal with in subtraction problems.

Meet Siah, a four year old math prodigy from Tamil Nadu's Dindigul district who, at just four years old, is solving problems that would leave most adults stumped. By the age of three, Siah had already mastered addition,