And good work all of us "not" in particulars.

]]>8 + 7 is fifteen (>=14) so fifty-something.

fifty-what??

Well 8 and 7 are 2 and 3 away from 10 and 2 x 3 = 6, so fifty-six!! 8 x 7 is 56.

Let's do another one.

9 x 3... So 9 + 3 is 12, darn (too bad) 12 < 14 so can't do this one with the 14-up method.

However 9 x 3 ends in a 7 because 9 and 3 are 1 and 7 away from ten and 1x7 is 7.

Let's do another one.

What's 8 x 8?? 8+8 is sixteen, so sixty-something and 8 and 8 are 2 and 2 away from 10 and 2x2 is 4, so 64!!!

Pretty fun, huh?

]]>Click on picture to see it bigger.

That is a clever way to illustrate it.

It works because 7×8 = (4+3)(4+4) = 4×4+4×4+4×4+3×4

And it works generally, so 7×8 = (4+3)(5+3) = 4×5+4×3+3×5+3×3

And could be useful when multiplying bigger numbers, too!

]]>6 x 8 is **fort**y-something because 6+8 is **fourt**een.

5 x 9 is **fort**y-something because 5+9 is **fourt**een.

So fourteen and up only is the safest rule to go by that's easy to remember.

]]>7 x 7 is **forty**-something because 7+7 is **four**teen.

7 x 8 is **fif**ty-something because 7 + 8 is **fif**teen.

7 x 9 is **sixt**y-something because 7 + 9 is **sixt**een.

8 x 8 is **sixt**y-something because 8 + 8 is **sixt**een.

8 x 9 is **sevent**y-something because 8+9 is **sevent**een.

9 x 9 is **eight**y-something because 9 + 9 is **eight**een.

If it's 13 or less it doesn't work all the time, so just use this for 14 to 18.

]]>50% means half

10% means take off the zero on the end, so 70 becomes 7, for example.

3 x 3

30% of 30

OR 50% of 30 minus 10% of 30 minus 10% of 30

OR half of 30 minus 3 minus 3

OR 3 + 3 + 3

OR 30/3 - 3/3

3 x 4

4 + 4 + 4

OR 30% of 40

OR 50% of 40 minus 10% of 40 minus 10% of 40

OR half of 40 minus 4 minus 4

OR half of 30 minus 3

OR 40/3 - 4/3

5 x 3

50% of 30

OR half of 30

OR 50/3 - 5/3

5 x 4

half of 40

5 x 8

half of 80

5 x 5

half of 50

6 x 5

5 plus half of 50

OR half of 60

6 x 6

6 plus half of 60

7 x 6

7 plus half of 70

OR 6 plus 6 plus half of 60

8 x 6

8 plus half of 80.

OR 60 minus 6 minus 6

9 x 6

9 plus half of 90.

OR 60 minus 6

7 x 8

half of 80 plus 8 plus 8

OR 70 minus 7 minus 7

I think of 7 x 8 as 70% of 80 or 50% of 80 plus 8 plus 8.

I think of 8 x 7 as 80% of 70 or 100% of 70 minus 7 minus 7.

I think of 6 x 4 as 60% of 40 or 50% of 40 plus 4.

7 x 9

90% of 70

OR 70 minus 7

OR 70% of 90

OR half of 90 plus 9 plus 9

Click on link to follow:

http://www.pagalguy.com/forum/prep-reso … metic.html]]>

See them here: http://www.mathsisfun.com/forum/viewtopic.php?id=2903

Did you notice an odd number times an odd number is always an odd number?

7x7=49 8x8=64 9x9=81

8x6=48 9x7=63

9x6=54 9x5=45

I shall follow the link provided and try to improve my times table, plus other simple levels of mathematics.

I'll return if I need anymore help/tips etc.

Thanks again

]]>