I want to teach Retro jnr his times tables, and was wondering if anyone here knew of an effective way of doing it. He's 7 and has the attention span of a ... well a 7 year old
I don't want him to learn parrot fashion like when I was at school I want him to work it out, so he understands why the answers are what they are. He's doing it at school but I want to "supplement" his maths skills a bit since I think maths is a very important skill to have and it's probably the only subject I'll be ultra pushy with.
The little kink in my plan is I don't see him everyday (he lives with my first Mrs) quite a distance a way.
I'm either going to need to do it via video (Skype) or via mail. For the mail I've thought of a few ideas, but I know there's a few teachers out there that would probably know a better way than I am thinking of.
Any help would be greatly appreciated.
1) teach him chess or a musical instrument, there is nothing that stimulates math skill more then this.
2)
well there are a few tricks to it, teach him groups for example. 4 groups 4 apples in it = 4x4 = 16
a few tricks for division of timetable
1) any number divided by 1 = its own number
2)any even number is dividable by 2
3)if you add all the numbers up and you end up with either 6,3, or 9 then it is dividable by 3 eg.
195 = 1+9+5 = 15 , 1+5 = 6 so it is dividable by 3
4) if the last 2 numbers are dividable by 4 then the number is dividable.
5) if a number ends with a 5 or 0 then it can be divided by 5
6) any odd number that has the same properties as the test for 3's , adding the integers should give you either 3,6, or 9
7) no test here sorry, or there is one but its way to complicated to explain to a 7 year old, anyway you should multiply the 2 left digits by 3 and keep adding it to the second digit, if you end up with a multiple of 7 it will be divisible, it is easier to just do it the normal way though.
8) the last 3 numbers should be dividable by 8
9) 549 is divisible by 9 since the sum of the digits is 18 (5+4+9=18), and 18 is divisible by 9. basically the same test as 3. but you have to end up with 9
10) easy, a number ends with 0
11) any number on the 11 timetable up to 99 is a integer repeating itself. also if you add the odd digits and the even digits and subtract the big one from the small one and end up with a multiple of 11 then that number is dividable by 11 , if you end up with 0 then it is also divisible.
12) the 12 timetable was the first one I learn, I come out of a family where 'math is everything', so basically my dad taught me chess when I was quite young, somehow I caught onto the 12 timetable easily , no idea why though.
12) 7x8 = 56, make sure he knows that, it is the hardest timetable by far, don't try and reason with it, its the law of mathematics and it just works that way! , we use to have a rhyme, 5 6 will give 7x8...
my dad use to tell me working backwards from 10, why is 3x9 = 27 well you basicalyl have 10 items, but each group has 1 item missing thus, 3x10 - 1x3 = 30, this helped a lot when counting money, working out 3 items that costs R2.99 for example = R3 * 3 - 1 cent *3 = 9.00 - 0.03 = 8.97. I use to do that in my head when going shopping with them. but yeah Mathematics is a great skill, but its not everything in life.