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Massive multiplication Brainteaser

by David, 13 November 2019 | 0 comments

Brain icon

Difficulty: Fun Sienna’s teacher is writing up a wicked problem on the board. First, the teacher writes all the numbers from 1 to 99. Then they erase 10, 20, and all the other numbers that end in 0. “Listen up!” the teacher announces. “I want you to multiply all the numbers on the board.

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No zeros Brainteaser

by David, 20 February 2019 | 2 comments

Brain icon

Which two whole numbers – without any zeros – multiply together to make 1 000 000?

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Card sums Activity

by David, 18 February 2016 | 0 comments

Card with a plus sign on back

Practice your sums with this fun card game.

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Napier’s bones Activity

by David, 18 June 2013 | 0 comments

four strips of paper with numbers on them. The top number on each strip is highlighted - 4, 6, 7, 0

How did people multiply before calculators were invented? You could try doing it in your head, but you could also use a mechanical calculator, such as this set of Napier’s bones.

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