Show the sum 72,300 + 21,000. Explain that you start by adding up the ten thousands numbers. 70,000 + 20,000 = 90,000. Then you add the thousands numbers together. 2,000 + 1,000 = 3,000. Next the hundreds numbers. Now add all the answers together. 90,0000 + 3,000 + 300 = 93,300. Have the students solve the next few problems on their own. Show the story problem. Explain that you first take the problem out of the story. Then you add the ten thousands numbers together.
Check whether the students can add to 100,000 with simple numbers with the following question:
- How can you add to 100,000 in steps with simple numbers?