MathOnMonday® Presents: Building Math Courage®

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MathOnMonday® Presents: Building Math Courage® Dirk M. Horton A program designed for Adults or Kids who have found learning math.

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MathOnMonday® Presents: Building Math Courage® A program designed for Adults or Kids who have struggled to learn their Math in the traditional classroom! Lesson 20.9 Learning Your Nines Dirk M. Horton dirk@mathonmonday.com

The Nines Pattern 9 + (10 – 1) = 18 + (10 – 1) = 27 + (10 – 1) = 36 Let’s count by nines by adding 9s using add 10 and subtract 1. Click your mouse to see the pattern develop. 9 One Nine + (10 – 1) = 18 Two Nines + (10 – 1) = 27 Three Nines + (10 – 1) = 36 Four Nines + (10 – 1) = 45 Five Nines + (10 – 1) = 54 Six Nines + (10 – 1) = 63 Seven Nines + (10 – 1) = 72 Eight Nines + (10 – 1) = 81 Nine Nines MathOnMonday© (March 2000)

The 10’s digit of the product Is 1 less than the “x by”. The 10’s Digit + the 1’s digit of the product always = 9. X by 10’s Digit 1’s Digit 9 x 2 = 1 8 1 + 8 = 9 2 + 7 = 9 3 + 6 = 9 4 + 5 = 9 5 + 4 = 9 6 + 3 = 9 7 + 2 = 9 8 + 1 = 9 -1 9 x 3 = 2 7 -1 9 x 4 = 3 6 -1 9 x 5 = 4 5 -1 9 x 6 = 5 4 -1 9 x 7 = 6 3 -1 9 x 8 = 7 2 -1 9 x 9 = 8 1 -1 MathOnMonday© (March 2000)

Click your mouse to see that you learned your 9s Click your mouse to see that you learned your 9s. Click for the problem, think about the 10’s digit, click again, and think about the 1’s digit, click again and see the result. 9 x 3 = 2 7 9 x 9 = 8 1 9 x 5 = 4 5 9 x 4 = 3 6 9 x 2 = 1 8 9 x 6 = 5 4 9 x 8 = 7 2 9 x 7 = 6 3 MathOnMonday© (March 2000)

One More Time! Click your mouse to see that you learned your 9s. Click for the problem, think about the 10’s digit, click again, and think about the 1’s digit, click again and see the result. 9 x 3 = 2 7 9 x 9 = 8 1 9 x 5 = 4 5 9 x 4 = 3 6 9 x 2 = 1 8 9 x 6 = 5 4 9 x 8 = 7 2 9 x 7 = 6 3 MathOnMonday© (March 2000)

Well done you are learning your nines Well done you are learning your nines! Practice a few times and you be a nines expert! 9 x 3 = 2 7 9 x 9 = 8 1 9 x 5 = 4 5 9 x 4 = 3 6 9 x 2 = 1 8 9 x 6 = 5 4 9 x 8 = 7 2 9 x 7 = 6 3 MathOnMonday© (March 2000)

The Nines Pattern 9 x 1 = 10x1 – 1 = 09 9 x 2 = 10x2 – 2 = 18 Nines are really cool you can multiply by 9 using an important number property: 10 x n -1 x n = 9 x n! Click your mouse to see the pattern develop. 9 x 1 = 10x1 – 1 = 09 One Nine 9 x 2 = 10x2 – 2 = 18 Two Nines 9 x 3 = 10x3 – 3 = 27 Three Nines 9 x 4 = 10x4 – 4 = 36 Four Nines 9 x 5 = 10x5 – 5 = 45 Five Nines 9 x 6 = 10x6 – 6 = 54 Six Nines 9 x 7 = 10x7 – 7 = 63 Seven Nines 9 x 8 = 10x8 – 8 = 72 Eight Nines 9 x 9 = 10x9 – 9 = 81 Nine Nines MathOnMonday© (March 2000)