Show the sum 80,344 + 1,922. Explain that you first add the ten thousands numbers together (80,000). Now you add the thousands numbers together (1,000). Then the hundreds numbers (300 + 900 = 1,200). Next the tens numbers (40 + 20 = 60). And finally the ones values (4). Then you add all the answers together to get the final solution (82,264). Practice this solving method together with the students for the next problem. Then you have the students solve three problems on their own. Show the sum 22,318 + 29,923. Explain that you can use the same solving method for these larger numbers, then you show the last problem with an example of a different solving strategy. Discuss this problem with the students and ask which other methods they could use to solve the problem. Then the students solve three problems on their own.
Check whether the students can add to 100,000 with the following question:
- What method do you use to solve a problem like this one (22,318 + 29,923 =)?