## Tuesday, 15 September 2020

### How to multiply? Make your mind up...

From an educational point of view I have wondered many times why so-called ‘experts’ keep changing either the curriculum or ways of working. For instance in my time multiplications were simple, you put the multiplicand up top and the multiplier below. Like this: 1234x64. Simple?
Of course it is. Working from right to left, take 4x4=16, put the 6 under the last column and remember the 1 to carried over. Next multiply 4 by 3=12, put the 2 to the left of the 6 but there was a carry so 2 becomes 3. Next, multiply 4 by 2=8, put the 9 left of the 3, (don’t forget there was a carry (1)). Next multiply 4 by 1=4. Put the 4 to the left of the 9. So now the first row shows 4936. Do the same for the next row, but before that as you are working in the order of tens (10) you have to put a zero under the 6 first of all. Then 6x4=24 put the 4 under the 3 and carry 2. Now 6x3=18 plus the carry is 20 put the zero under the 9 and carry is again 2. Now 6x2=12 plus carry of 2=14 put the 4 under the 4 and carry is 1. Lastly 6x1=6 plus carry=7. Put the 7.