Column Addition
- First choose a random sum for example 546+982.
- Now write the number 546 and then 982 underneath it.
- Don’t forget to put the two under the six, the eighty under the forty and the nine hundred under the five hundred.
- Add together the six and the two, 6+2=8.
- Add together the forty and the eighty, 40+80=120.
- Add together the five hundred and the nine hundred, 500+900=1400, but you have an extra hundred from 120 so it equals 1500.
- You then have to add one thousand.
- Then you have to write the numbers in order, one thousand, five hundred, twenty and eight or 1528.
Column Subtraction
- First choose a random sum for example 156-32.
- Now write the number 156 and then 32 underneath it.
- This time make sure that the two is under the six, and the thirty under the fifty, but leave nothing under the one hundred.
- Subtract two from six, 6-2=4.
- Subtract thirty from fifty, 50-30=20
- Leave the 100 as it is.
- 156-32=124