What do you notice? What do you wonder?

Subtract. Seventy thousand, plus five thousand, plus nine hundred, plus forty, plus zero, minus, ten thousand, plus two thousand, plus seven hundred, plus eighty, plus six, equals sixty thousand, plus three thousand, plus one hundred, plus fifty, plus four.

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1. Use the standard algorithm to find the value of each sum and difference. If you get stuck, try writing the numbers in expanded form.
2. Find the unknown value that would make each computation true.

   

   

1. Kiran tries to find the sum of 204,500 and 695. He isn’t sure how to set up the calculation, so he writes 2 ideas. Which way is correct? Explain your reasoning.

    

   

   

2. Lin makes some errors when subtracting 4,325 from 61,870. Identify as many errors as you can find. Then show the correct way to subtract.