Number bonds to 20
Number bonds to 20 extend the bonds to 10. Once a child knows 3 + 7 = 10, the bond 13 + 7 = 20 follows from it rather than needing to be learnt fresh.
Practise bonds to 20 →Asked as 20 − ? , which is the same fact from the other side
Every pair
1 + 1920
2 + 1820
3 + 1720
4 + 1620
5 + 1520
6 + 1420
7 + 1320
8 + 1220
9 + 1120
10 + 1020
How to learn them
Build every bond to 20 from its bond to 10. If 4 + 6 = 10, then 14 + 6 = 20.
Questions
▸What are number bonds to 20?
Number bonds to 20 extend the bonds to 10. Once a child knows 3 + 7 = 10, the bond 13 + 7 = 20 follows from it rather than needing to be learnt fresh.
▸What goes with 1 to make 20?
1 + 19 = 20.
▸How do you learn them?
Build every bond to 20 from its bond to 10. If 4 + 6 = 10, then 14 + 6 = 20.