 |
Java Games: Flashcards, matching, concentration, and word search. |
 |
|
Multiplication Tricks with 8s: the double, double, double
When you multiply by 8, add the other number to itself, add that number to itself, and then add that number to itself.
What is 8 x 4? 4+4=8, then add it to itself -> 8+8=16, then add that to itself -> 16+16=32
|
| A | B |
|---|
| 8x0 | 8x0=0 Anything times zero is 0 |
| 8x1 | 8x1=8 Anything times 1 is itself |
| 8x2 | 8x2=16 2+2=4, 4+4=8, 8+8=16 |
| 8x3 | 8x3=24 3+3=6 6+6=12 |
| 8x4 | 8x4=32 4+4=8 8+8=16 16+16=32 |
| 8x5 | 8x5=40 5+5=10 10+10=20 20+20=40 |
| 8x6 | 8x6=48 6+6=12 12+12=24 24+24=48 |
| 8x7 | 8x7=56 7+7=14 14+14=28 28+28=56 |
| 8x8 | 8x8=64 8+8=16 16+16=32 32+32=64 |
| 8x9 | 8x9= 9+9=18 18+18=36 36+36=72 |
| 8x10 | 8x10=80 Anything times ten has a zero at the endq |
| 8x11 | 8x11=88 Twins trick |
| 8x12 | 8x12=96 8x11, then add=96 |
|
|
|
|
|
Third Grade Teacher |
| Southern California, CA |
|
|
|
|
|
| |
