Maths - Rounding and Compensating Strategy

This term we have started to learn a new strategy to solve addition and subtraction problems. We have been learning about the rounding and compensating strategy. 

To solve equations, we round one of the numbers, so that it becomes a tidy number. Then we add or subtract the other number. Before we finished, we need to remember to adjust our calculation by compensating the rounding back again.

Here we are trying to solve 303 + 58 = 

We discussed our workings with a buddy. 

This is how we solved this problem:

303 - 3 = 300
300 + 58 = 358
358 + 3 = 361