Alternative Multiplication Methods On (11x11) - (99x99)

-1

No comments posted yet

Comments

Slide 1

PuworkUtara 2014 I tried to understand some alternative generalizations even they are not approval at all. But, as a part of learning I appreciate any of your comment..... …..constructive or destructive.. Thanks

Slide 2

Multiplication ( Tips & Tricks ) With 7 Methods Focus on 9 1 X 91 to 99 x 99 ( 2-Digits Vs 2-Digits

Slide 3

9 2 x 9 5 Method 1 : Preservative Law 8 1 1 0 6 3 8 7 4 0 Read as 9 X 9 = 81 Then, 7 X 9 = 63 Read as 2 X 5 =10 2 + 5 = 7 + 92 X 95 = 8 740 Usage : Recommended for 91x91 to 99x99 only.

Slide 4

9 2 x 9 5 Method 2 : Complement 10 8 0 0 0 8 8 X 5 = 40 + 5 2 + 5 = 07 1. Add up the Digits of Ones 2. Find out the 10 complement of the Digits Ones 3. Build up a diagram / table to locate the answer 4. 1st Row, staring from TH, just fill with 8000 5. 2nd Row, staring from TH, fill with 07 as 2+7 = 07 0 7 6. 3rd Row, staring from Tens, fill with 40 as 8 X 5 = 40 4 0 8 7 4 0 7. Add up and we will get the answer, exactly 8 7 4 0 91x91 to 99x99 only.

Slide 5

9 2 x 9 5 Method 3 (a): Crossing 1 1 8 1 1 0 1 8 4 5 8 7 4 0 Read as 9 X 9 = 81 Read as 9 X 5 = 45 Read as 2 X 5 =10 Read as 2 X 9 = 18 + 92 X 95 = 8 740 Usage : Recommended for all, 11x11 to 99x99

Slide 6

2 Method 3 (b): Crossing 2 8 1 1 0 6 3 0 9 X 9 =81 + 92 X 95 = 8 740 Usage : Recommended for all, 11x11 to 99x99 5 x 2 X 5 = 10 9 X 2 = 18 9 X 5 = 45 63 9 9 4 7 8

Slide 7

8 1 8 1 0 1 5 4 9 5 2 9 x 9 2 x 9 5 = 0 4 1 7 8 Answer; 8 7 4 0 8 + 1 + 5 = 14 , retains 4, regroup 1 1 + 1 + 1 + 4 = 7 , Without regrouping 0, just drop 0 8, drop 8 Usage : Recommended for all Method 4 : Napier Bone

Slide 8

2 90 x 90 5 Total 8100 180 8280 450 10 460 8740 9 2 x 9 5 = Usage : Recommended for all Method 5 : Grid

Slide 9

9 2 x 9 5 Method 6 : Long Method 1 8 1 0 0 4 5 0 1 8 0 1 0 8 7 4 0 Read as 9 X 9 = 81, write as 90 X 90 = 8100 Read as 9 X 9 = 81, write as 90 X 5 = 450 Read as 2 X 9 = 18, write as 2 X 90 = 180 Read and write as 5 X 5 = 10 + Usage : Recommended for all, 11x11 to 99x99

Slide 10

9 2 x 9 5 Method 7 – Traditional 0 1 4 6 8 1 8 2 5 x 2 = 10 , retains 0, regroup 1 5 x 9 = 45, 45 + 1 = 46 9 x 2 = 18 , retains 8, regroup 1 9 x 9 = 81, 81 + 1 = 82 + 0 4 7 8 1 Usage : Recommended for all

Summary: Alternative Multiplication Methods On (11x11) - (99x99)

Tags: multiplication 2-digits two digits alternative

URL: