Using whole number place value for two-digit addition and subtraction

New Zealand Curriculum: Level 2 to early Level 3

Learning Progression Frameworks: Additive thinking, Signpost 5 to Signpost 6

Target students

These activities are intended for students who understand place value with two-, and possibly three-digit numbers but are not yet able to use this knowledge to solve two-digit addition and subtraction problems. For some students, revision of addition and subtraction basic facts (number bonds to 20), may be needed prior to, and alongside the use of these activities.

The following diagnostic questions indicate students’ understanding of, and ability to use, place value to solve two-digit addition and subtraction problems. The questions are presented in order of complexity. If the student answers a question confidently and with understanding proceed to the next question. If not, use the supporting activities to build and strengthen their fluency and understanding. Allow access to pencil and paper but not to a calculator. (show diagnostic questions)

Teaching activities