1. MENTAL MATH PART III SUBTRACTION & THE LAST OF HWK #1

2. SUBTRACTION -TRADING ONE PROBLEM FOR ANOTHER If you would like to change A-B to an easier problem then you should do what to the numbers to assure that you get the same answers? Add or subtract the same number to both. Make the number you subtract as easy as possible to work with!

3. EXAMPLES 198-89 =209-100=109 1533-367 = 1566-400=1166 121-88 =123-90 =133-100=33

4. One More Example 2021-857 =2024-860 =2064-900 =2164-1000 =1164

5. Compensating one digit at a time 3091 -867 ------------ 7 to 10 is 3 3+1 =4 But the 9 is now an 8. 8-6 is 2 8 to 10 is 2 0+2 is 2 But the 3 is now a 2. 4222

6. Compensating one digit at a time 908656 -95666 ------ 812990 578

7. Compensating one digit at a time 771152 -543333 ----- 227819 4 0 6

8. Compensating one digit at a time 987654321 -123456789 --- 864197532 12345

9. Compensating one digit at a time 1111111110 -123456789 --- 987654321 000000000

10. What are the possibilities for digits a,b and x? aaaabbb -bbbaaa ----- ?xxxxxx

11. Each letter is a different digit – find them! ABCDEFGXYZ -XCFEGADYBZ --- 4151017710 If you get stuck just text me at 7757220658 For a hint!