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how do you teach your dc to add higher up than 10?

13 replies

dinny · 01/03/2008 15:28

easily? dd still has to use fingers above 10 and it gets complicated for her.

have tried telling her to put 10 in her head, but am not explaining it well! thanks

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BreeVanDerCampLGJ · 01/03/2008 15:39

It will click when she is ready, DS YR2 still uses his fingers, and his toes I should think.

Does she have a number line ?

dinny · 01/03/2008 15:49

number line....

she has a number square...is that the same thing?

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KerryMum · 01/03/2008 15:52

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Reallytired · 01/03/2008 16:03

Get her to count in tens and then the units. So if she needs to add 22 + 11 she can do it in two steps.

Partition 11 into tens and units ie. 11=10+1
Then you can approach the problem in two different steps.

22 +10 =32
32 + 1 = 33

LIZS · 01/03/2008 16:04

Think they split them out so 12+11 becomes 10+2+10+1 add 10+10 then 2+1 so 20+3.

Caz10 · 01/03/2008 16:09

what year is she in dinny?

tens & units is the way to go imo but it depends if she can understand that.

work with concrete objects to start with, eg 10 smarties plus 5 smarties

teach number bonds, she'll learn them off by heart eventually, ie you just know that 4 + 8 = 12 without having to count

jump along a number line/square

teach "tricks", eg doubles

i think a combination of things helps it to "click" when she is ready.

good luck!

ChasingSquirrels · 02/03/2008 21:04

breaking down into managable steps,
either total partitioning (24 + 46 = 20 + 4 + 40 + 6 = 4 + 6 (=10) + 20 + 40) or partial partitioning if she is upto it (ie 24 + 46 = 24 + 40 + 6).
Columns is far easier if you get it, but they don't teach columns in school until later on, they do lots of mental maths to try and ensure they actually understand the concepts, rather than just having to learn the rules.

Waswondering · 02/03/2008 21:08

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colditz · 02/03/2008 21:13

get her an abacus?

Hulababy · 02/03/2008 21:17

DD's school use a number line.

mummyoffrankie · 02/03/2008 22:10

ask your dc school how they teach it.. i started showing my 7yo dc the way i was taught (numbers on top of each other then carry over etc etc) and its all wrong apparently. if you dont show them in the same way they are taught at their particular school it confuses them even more.

dinny · 02/03/2008 22:17

thanks, all, dd is only 5, was just wonderign how I could help her as she gets soooo annoyd when she runs out of fingers and toes (though she does have a number square)

good idea about asking school, will do, and hadn't considered an abacus, thank you!

OP posts:
ChasingSquirrels · 03/03/2008 15:52

I took the abacus remark as a joke!
ds is also 5 (reception) and I initially explained columns which he understood but which I didn't push, then I found out about partitioning (which I posted yesterday) and explained that - he still uses his fingers but can add more than 10 using it.
I also say "what do you need to make the number to 10 - then take it from the other number and what's left" (so 9+4, need 1 to make 9 to 10, then 4-1=3, so the total is 10+3). Practice adding on 10 so that they can do that bit easily.
Another thing is to keep a number in you head and add onto it (so 9 in your head and use fingers to add on 4).
Also - start with the higher number so there is less to add on - although to do that they have to conceptually get that x + y = y + x.

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