number bonds

WALT: We are learning number bonds to 10, 20, 50 and 100.

A number bond is adding a number to a another number to make a tidy number.

To 10 
3+7=10
5+5=10

To 20
18+5=20
14+6=20

To 50
41+9=50
45+5=50

To 100
92+8=100
96+4=100

This was so hard because I could not understand it but I do now.

Do you know any other number bonds?