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Quick question: What does 'number bonds to 20' mean?

(10 Posts)
Issy Sat 13-Sep-08 20:08:24

DD1's homework for this weekend is to revise the number bonds to 20. Does that mean any addition of two numbers the sum of which is 20 or less or the addition of two numbers the sum of which is 20.

Or more simply, does DD1 have to learn 12+6 and 9+7 and the rest or just 11+9, 12+8, 14 +6 etc..

Hassled Sat 13-Sep-08 20:10:07

The sum of which is 20 only, not less, I believe. So 12 + 8, not 12 + 7.

LIZS Sat 13-Sep-08 20:10:10

I think just the latter.

tissy Sat 13-Sep-08 20:13:02

Yes, dd's school call it the "story of 20", and they have to do

1+19
2+18
3+17 and so on.

Bink Sat 13-Sep-08 20:14:13

Just the pairs which make 20 exactly - plus perhaps sequences, so 10 + 5 + 5, eg. But your destination should always be 20.

I think.

Did you see my post about the aqua jumper?

Issy Sat 13-Sep-08 20:16:40

Thank you all. Although even the more limited set of bonds will be a struggle.

Bink: No I didn't see your post about the aqua jumper. Did you see my post about DD1 breaking my nose!

www.mumsnet.com/Talk/1375/605794

Off to find aqua jumper...

MrsWeasley Sat 13-Sep-08 20:20:21

number bonds to 20 means 2 numbers that add up to 20
so 0+20, 1+19, 2+18, 3+17,4+16, 5+15, 6+14, 7+13, 8+12, 9+11, 10+10, 11+9, 12+8, 13+7, 14+6, 15+5, 16+4, 17+3, 18+2, 19+1, 20+0

Its worth doing both 2+18 and 18+2 because children don't always realise they are same sums.

No taking away numbers only numbers that add to 20

Our school calls them "special friends" that add up to 20. grin

HTH

Janni Sat 13-Sep-08 20:26:05

See! Who even needs to go to school? Just ask MN smile]

MrsWeasley Sat 13-Sep-08 20:36:32

Between us we could rule the world.

MrsWeasley Sat 13-Sep-08 20:36:54

oh sorry, forget we already do grin

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