Multiplying 2 numbers close to 100
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This document provides examples of multiplying two numbers close to 100 using the base 100 method. It demonstrates: 1) Multiplying 88 x 98 by writing them as distances from 100, getting 8600, then adding the adjustment of 12 x 2 = 24, for a total of 8624. 2) Multiplying 102 x 104 by writing them as distances from 100, getting 10600, then adding the adjustment of -2 x -4 = 8, for a total of 10608. 3) Multiplying 97 x 102 with one number below and one above 100, getting 9900, then subtracting the adjustment of 3 x -2 = -6, for a total of 9894.
Multiplying 2 numbers close to 100
- 1. Coffee Math: Methods, Tips And Tricks Series. By Puwork Utara May 2011
- 2. Multiplying 2 Numbers Close to 100 They are in the base 100. Hence the reference point (base) will be 100.
- 3. 88 X 98 = ______ Both numbers are close to 100 but less than 100
- 4. 88 X 98 = ______ 88 +12 100 98 +2 100
- 5. 88 X 98 = ______ 88 +12 100 98 +2 100 Either ( 88 - 2 ) X 100 = 8600 Or ( 98 - 12 ) X 100 = 8600
- 6. 88 X 98 = ______ 88 +12 100 98 +2 100 Either ( 88 - 2 ) X 100 = 8600 Or ( 98 - 12 ) X 100 = 8600 And 12 X 2 = 24
- 7. 88 X 98 = ______ 88 +12 100 98 +2 100 Either ( 88 - 2 ) X 100 = 8600 Or ( 98 - 12 ) X 100 = 8600 And 12 X 2 = 24 Last 8600 + 24 = 8624 #
- 8. 102 X 104 = ______ Both numbers are close to 100 but more than 100
- 9. 102 X 104 = ______ 102 -2 100 104 - 4 100
- 10. 102 X 104 = ______ 102 -2 100 104 - 4 100 Either ( 102 + 4 ) X 100 = 10600 Or ( 104 + 2 ) X 100 = 10600
- 11. 102 X 104 = ______ 102 -2 100 104 - 4 100 Either ( 102 + 4 ) X 100 = 10600 Or ( 104 + 2 ) X 100 = 10600 And -2 X -4 = + 08
- 12. 102 X 104 = ______ 102 -2 100 104 - 4 100 Either ( 102 + 4 ) X 100 = 10600 Or ( 104 + 2 ) X 100 = 10600 And -2 X -4 = + 08 Last 10600 + (+08) = 10608 #
- 13. 97 X 102 = ______ One of the numbers is less than 100 and the second number is more than 100
- 14. 97 X 102 = ______ 97 +3 100 102 - 2 100
- 15. 97 X 102 = ______ 97 +3 100 102 - 2 100 Either ( 97 - ( -2)) X 100 = 9900 Or ( 104 - 3 ) X 100 = 9900
- 16. 97 X 102 = ______ 97 +3 100 102 - 2 100 Either ( 97+ 2 ) X 100 = 9900 Or ( 104 - 3 ) X 100 = 9900 And +3 X (-2 ) = - 06
- 17. 97 X 102 = ______ 97 +3 100 102 - 2 100 Either ( 97+ 2 ) X 100 = 9900 Or ( 104 - 3 ) X 100 = 9900 And +3 X (-2 ) = - 06 Last 10600 + (- 06 ) = 9894 #
- 18. END