Page 99 - New Medley 1 Semester 2

4. 17 – 9 = ?

= ten + ones – ones

= ones + ones – ones

= ones – ones = ones

So: 17 – 9 =

B. Let us subtract mentally.

1. 16 – 9 = 2. 17 – 8 = 3. 15 – 7 =

4. 13 – 5 = 5. 14 – 8 = 6. 15 – 6 =

C. 1. 1 1 2. 1 2 3. 1 3 4. 1 4 5. 1 2 6. 1 4

– 6 – 5 – 4 – 5 – 6 – 7

7. 1 3 8. 1 5 9. 1 4 10. 1 5 11. 1 6 12. 1 7
– 5 – 7 – 8 – 8 – 9 – 9

13. 1 1 14. 1 2 15. 1 3 16. 1 4 17. 1 5 18. 1 6

– 3 – 3 – 6 – 6 – 5 – 8

Vertical Subtraction (With borrowing)

Let us do 42 – 7.

Step 1: 2 < 7

So we borrow 1 ten from 4 tens.

We cross out 4 and write 3. (3 tens is left)

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