Download Speed Math for Kids_ Helping Children Achieve Their Full by Bill Handley PDF
By Bill Handley
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Additional info for Speed Math for Kids_ Helping Children Achieve Their Full Potential
Example text
Yes, 7 + 2 = 9, so we cross out the 7 and the 2. We add the other digits: 6 + 2 + 4 = 12 1+2=3 Three is our substitute answer. I write the substitute numbers in pencil above or below the actual numbers in the problem. It might look like this: Is 62,472 the right answer? We multiply the substitute numbers: 2 times 6 equals 12. The digits in 12 add up to 3 (1 + 2 = 3). This is the same as our substitute answer so we were right again. Let’s try one more example. Let’s check if this answer is correct: 456 × 831 = 368,936 We write in our substitute numbers: That was easy because we cast out (or crossed out) 4 and 5 from the first number, leaving 6.
If you want to multiply 4 by 11, you simply repeat the digit for the answer, 44. If you multiply 6 by 11 you get 66. What answer do you get if you multiply 9 by 11? Easy, 99. Did you know it is just as easy to multiply two-digit numbers by 11? Multiplying a two-digit number by 11 To multiply 14 by 11 you simply add the digits of the number, 1 + 4 = 5, and place the answer in between the digits for the answer, in this case giving you 154. Let’s try another: 23 × 11. 2+3=5 Answer: 253 These calculations are easy to do in your head.
Four times 2 is 8, plus 160 is 168. 4, but we have calculated 12 × 14, so our work isn’t finished yet. We have to place a decimal point in the answer. To find where we put the decimal, we look at the problem and count the number of digits after the decimals in the multiplication. 4. Because there are two digits after the decimals in the problem, there must be two digits after the decimal in the answer. We count two places from the right and put the decimal between the 1 and the 6, leaving two digits after it.