Solve addition and subtraction problems using groups of ten.
Solve addition and subtraction problems by using place value partitioning.
Number Framework Stages 4 and 5
Ones and tens materials. E.g. sticks in bundles, BeaNZ, play money
Required Knowledge
Before attempting this activity check that the students can instantly recall the single digit subtraction facts.
Examples. Word stories and recording for: 45 – 20, 52 - 10, 42 – 20, 35 – 30, 63 – 50, 48 - 30....
Shielding and Imaging Only: Examples. (Instant recall of single digit subtraction facts is needed here.) Word stories and recording for: 48 – 40, 51 – 20, 53 – 50, 27 – 20, 64 – 10, 43 – 40, 57 – 50, 71 - 40....
Examples. 97 – 10, 78 – 30, 20 + 62, 46 + 50, 80 + 17....
Challenging examples. The students will need to understand the meaning of three digit numbers to do these: 240 – 20, 340 – 40, 443 – 20, 570 - 20....
Printed from https://nzmaths.co.nz/resource/subtracting-tens at 10:58pm on the 2nd May 2024