In the first square the boxes at the end of each row and the foot of each column give the result of multiplying the two numbers in that row or column.
Can you find 4 consecutive numbers to complete the second multiplication square in the same way?
Make up puzzles for your friends like this one.
MAKE UP YOUR OWN PUZZLES Put 4 consecutive numbers into a 2 by 2 square, work out the products. Then give your friends the products (not the 4 consecutive numbers). Can they find 4 consecutive numbers and put them in the right places to get your products?
The 3 by 3 multiplication square works in the same way. The boxes at the end of each row and the foot of each column give the result of multiplying the three numbers in that row or column. Can you use the digits 1 to 9, each once and only once, to give the correct products of the 3 numbers for each row and column?
MAKE UP YOUR OWN PUZZLES For the 3 by 3 multiplication puzzle, put the numbers 1 to 9 into a 3 by 3 square in any order, then work out the products, then give your partner just the products and challenge them to put the digits 1 to 9 in the right places.