Count forwards and backwards in eights using this counting stick. If we know the answer to a multiplication number sentence or multiplication fact we can work out the answer to an unknown number ...

In long multiplication we break the sum down into ... To multiply a number by 40, we will multiply by 10 and then by 4. Placing the zero in the ones column is the multiplying by 10 bit!

Fundamental problems about multiplication — about, say, how numbers factor into primes — suddenly become much deeper and more challenging as soon as addition enters the picture. One of math’s biggest ...

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A simple math question posed by a woman in a viral video ... shows a woman asking her partner, "What is half of 4 + 4?" ...