In this small step, children use their knowledge of number bonds to 10 to add numbers within 20. Children are familiar with using the counting on method for calculations that
cross a 10, but the purpose of this step is to improve both efficiency and accuracy using number bonds.
Children need to be able to partition a number into two parts
in order to use number bonds to 10 to simplify a calculation

Toucans found this a little tricky but many persevered and found it useful.

Extension: Review the learning at home.