Sand Reckoning
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- Tell whether the number sentences are true or false. Be ready to explain your thinking. Use number lines or other strategies.
- 10,000,000 + 30,000 + 2,000 = 10,000,000 + 3 10,000
- 32,074,000,000 = 30,000,000,000 + 2,000,000,000 + 70,000,000 + 4,000,000
- 8,000,000 + 900,000 + 40,000 + 6,000 = 9,000,000 − 100,000 + 40,000 + 6,000
- 1,235,000 = 1 2,000,000 + 2 100,000 + 3 10,000 + 5,000 1
- 5,045,000 = 500,000 + 400,000 + 500,000
Professor Peabody wrote the following equation on the board. He asked Romesh to help him find the number that will make the number sentence true.
3,072,000 = 3,000,000 + n + 2000
- Replace the letter with a number to make each sentence true.
- 8,920,000 = 8,000,000 + n + 20,000
- 96,500,000 = 9 10,000,000 + h + 500,000
- 40,000,000 + 3,000,000 + 10,000 + 7,000 = 43,000,000 + g
- 300,000,000 + 1,000,000 + 4 100,000 = 3 100,000,000 + 1,000,000 + h
- 5,783,000 = 5,000,000 + 700,000 + r + 3,000