![]() ![]() ![]() If a number is only divisible by itself and 1, it is called a prime number.īut there's more than one way to write 12 as a product of two numbers: Since 3 and 4 are both whole numbers, they are called factors of 12, and 12 is said to be divisible by 3 and by 4. ![]() This means 12 can be broken into 3 pieces, each of size 4. Remember that dividing a number just means breaking it into pieces of equal size. To go further with multiplication we first need to do some dividing. So if your aim is to memorise the table, you really only need to memorise about half of it. The numbers above the diagonal line are like a mirror image of the numbers below the line. This holds true for any pair of numbers-in mathematics we say that multiplication is commutative.īut this fact means that there is a symmetry in the multiplication table. So from this we can see that 5 × 7 is the same as 7 × 5. The length and height of the rectangle have swapped, but the area hasn't changed. ![]()
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