We started the week by using column addition to add 3-digit and 2-digit numbers that included exchanging. Exchanging in maths—also called regrouping or borrowing—is the process of moving a value from one place value column to another so you can complete a calculation.

Here we have exchanged in the ones column and added the value into the tens column.

We then used this knowledge to solve problems.

Here you can see the exchanged number below the column addition calculation.

 Then today we moved on to exchanging tens into hundreds and crossing the hundreds. 

In the Ready task, you can see where 50 + 60 = 1100 and a 1 is placed in the tens column and the hundreds column beneath the calculation. Then 600 + 100 = 700 (shown as a 7 in the hundreds column).

We then used this knowledge to solve problems in our Go and Turbo challenges. 

Here we had to work out what the missing numbers were.