Written Addition – Carrying on
Sums that are too hard to work out in your head may need to be worked out on paper. Write the sum in columns, lining up the ones, tens, hundreds and so on. Then starting with the lowest place value (on the right), add the digits in each column.
If the number add up to over 10 then write the ones between the lines and carry the tens over to be added with the other tens.
You can use this way of calculating sums for numbers of any size. Can you work out the sum for 5 digit numbers?
Add and subtract your way across the Hexafield in this Mission 2110 game.