The question. Look at your question carefully read it a few times.
The strategy . Use the strategy below to get the answer. The strategy is just making tidy numbers.
+ 1 = 390 + 10 = 400 + 200 =
Tidy numbers are any numbers that end with 0.
It may be helpful to under line the number that you have added.
The answer. The last step is to put all the numbers we added together you may want to underline the numbers we added. Look at how the under lined numbers relate to the answer.