Your child will learn his/her number bonds to ten in KS1. It is essential that your child practises them until he/she has instant recall.
Your child may find this quite difficult at first. Make a game of it, practise in the car; throw a ball to each other; ask your child to run across the living room etc.
If your child struggles then make sure you keep reminding him/her over time until they are embedded.
We have encountered children in Upper KS2 who cannot recall these number pairs and their manipulation of numbers in any calculation suffers. This poster shows how knowledge of number bonds to 10 can be converted to number bonds to 20.
Number bonds to 100 follows. Here your child will partly use number bonds to 10 to work them out. A word of warning, when starting to convert number bonds to 10 into number bonds to 100 your child will likely do the following: 43 pairs with 67 to make 100. What he/she will have done there is just say 3 needs a 7 to make 10 and 4 needs a 6 to make 10. In this instance you will need to work through with your child that when the 7 goes with the 3 it makes the next ten so then there is only 5 more tens needed. A hundred square is useful here to show how adding the initial 7 gets to the next ten number.
Number bonds to 60 are also useful because they help when your child is telling the time.