1. No Pencil or Paper Needed!

2.  Make sure you know your multiplication tables up to 10

3.  Multiplying by 2 is sometimes called “doubling”  12 x 2 = 24  62 x 2 = 124  567,987 x 2 = 1,135,974  (ok…that one was a bit hard!)

4.  Dividing by 2 is sometimes called “halving”  12 ÷ 2 = 6  62 ÷ 2 = 31  127,988 ÷ 2 = 63,994

5.  Multiplying by 10 is easy…just add a zero to the number.  9 x 10 = 90  63 x 10 = 630  398 x 10 = 3,980  11,456 x 10 = 114,560  This works no matter how large or small the number is!

6.  To multiply any number by 5 all we need to do is to multiply the number by 10 (which is easy!) and divide the answer by 2  Let’s do 23 x 5  23 x 10 = 230  230 ÷ 2 = 115  Let’s try another…

7.  72 x 10 = 720  720 ÷ 2 = 360  Let’s try one more…

8.  120 x 10 = 1200  1200 ÷ 2 = 600  Easy…

9.  15 x 13 (place larger number first)  Add the first number (15) to the second digit of the second number (3) 15 + 3 = 18  Add a zero to the result to get 180 (multiply by 10)  Multiply the second digits of each number 5 x 3 = 15  Add 180 + 15 = 195  Let’s try another one!

10.  19 + 7 = 26  Add a zero to get 260  9 x 7 = 63  260 + 63 = 323  Let’s try a few more….

11.  16 + 3 = 19  Add a zero to get 190  6 x 3 = 18  190 + 18 = 208

12.  18 + 7 = 25  Add a zero to get 250  8 x 7 = 56  250 + 56 = 306

13.  To multiply any two digit number by 11:  (For this example we will use 54.)  Separate the two digits in you mind (5__4).  (Notice the hole between them!)  Add the 5 and the 4 together (5 + 4 = 9)  Put the resulting 9 in the hole 594. That's it! 11 x 54 = 594  Let’s try one…

14.  Seperate the numbers (2 _ 7)  Add the digits (2 + 7 = 9)  Place the 9 in the hole (297)  27 x 11 = 297  Let’s do one more…

15.  7 _ 1  7 + 1 = 8  71 x 11 = 781

16. The only thing tricky to remember is that if the result of the addition is greater than 9, you only put the "ones" digit in the hole and carry the "tens" digit from the addition. For example 11 x 57... 5__7... 5 + 7 = 12... put the 2 in the hole and add the 1 from the 12 to the 5 in to get 6 for a result of 627... 11 x 57 = 627

17.  57 x 11  57 x 11 = 57 x (10 + 1)  57 x 10 = 570  57 x 1 = 57  570 + 57 = 627

18.  Can you multiply a number by 10?  Can you double a number?  Can you add them together?  Then you can multiply by 12!

19.  To multiply a number by 12 you first multiply the number by 10  24 x 10 = 240  You then double the original number  24 x 2 = 48  Then add the results together  240 + 48 = 288  Let’s try one…

20.  63 x 10 = 630  63 x 2 = 126  630 + 126 = 756  One more…

21.  125 x 10 = 1250  125 x 2 = 250  1250 + 250 = 1500

22.  For this example we will use 25  Take the "tens" part of the number (the 2) and add 1 to get 3  Multiply the original "tens" part of the number by the new number (2 x 3)  Take the result (2 x 3 = 6) and put 25 behind it The answer is 625  Let’s try another one…

23.  3 + 1 = 4  3 x 4 = 12  Place the 25 at the end to get 1225  Lets try another one…

24.  4 + 1 = 5  4 x 5 = 20  Place the 25 at the end to get 2025  Let’s square 75…

25.  7 + 1 = 8  7 x 8 = 56  Place the 25 at the end to get 5625  Simple…

26.  2.95  6.95  7.80  1.90  4.75  1.25  3.95  29.55

27. 33 77 88 22 55 11 44  30

28. If you don’t need an exact answer rounding the numbers can make the problem much easier. Say you are shopping and you want to see about how much you’ve spent…

29.  $2.953  $6.957  $7.808  $1.902  $4.755  $1.251  $3.954  $29.55 30 By rounding the numbers you make the problem much easier and your answer is only off by $0.45 cents… not too bad!