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Trade-First Subtraction Algorithm for Easy Math | Mastering Math with Rina Iati

Learn the alternative subtraction algorithm created by Rina Iati from South Western School District, Hanover, PA. This innovative approach simplifies subtraction by starting from left to right, avoiding regrouping struggles. Practice with examples provided.

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Trade-First Subtraction Algorithm for Easy Math | Mastering Math with Rina Iati

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  1. Trade-First Subtraction An alternative subtraction algorithm Created by Rina Iati, South Western School District, Hanover, PA

  2. 12 When subtracting using this algorithm, start by going from left to right. 8 12 13 9 3 2 - 3 5 6 Ask yourself, “Do I have enough to subtract the bottom number from the top in the hundreds column?” In this problem, 9 - 3 does not require regrouping. 5 7 6 Move to the tens column. I cannot subtract 5 from 3, so I need to regroup. Move to the ones column. I cannot subtract 6 from 2, so I need to regroup. Now subtract column by column in any order Created by Rina Iati, South Western School District, Hanover, PA

  3. 11 Let’s try another one together 6 15 12 7 2 5 - 4 9 8 Start by going left to right. Ask yourself, “Do I have enough to take away the bottom number?” In the hundreds column, 7- 4 does not need regrouping. 2 2 7 Move to the tens column. I cannot subtract 9 from 2, so I need to regroup. Move to the ones column. I cannot subtract 8 from 5, so I need to trade. Now subtract column by column in any order Created by Rina Iati, South Western School District, Hanover, PA

  4. 13 8 12 14 9 4 2 - 2 8 7 Now, do this one on your own. 6 5 5 Let's see if you're right. Congratulations! Created by Rina Iati, South Western School District, Hanover, PA

  5. 9 Last one! This one is tricky! 6 13 10 7 0 3 - 4 6 9 2 3 4 Let's see if you're right. Congratulations! Created by Rina Iati, South Western School District, Hanover, PA

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