More Comparisons
Recall addition and subtraction facts to 20.
Number Framework Stage 5
Using Materials
Problem: Sarah has $14 and Denise has $8. How much more money does Sarah have than Denise?
In pairs one student is Sarah and the other Denise; they build 14 and 8 typically in lines with counters or Unifix/Multilink cubes. They need to make the connection that the problem is solved by working out either 14 - 6 or 8 + ? = 14. Write whichever of these arises in the discussion on the board. Discuss why the answer is 6 and write this on the board.
Examples. Comparison word stories and recording for: 3 + ? = 7, 5 + ? = 10, 9 + ? = 13, 6 + ? = 11, ? + 8 = 12, …
Using Imaging
Problem: Karen has $8 and Fiona has $3. How much more money does Karen have than Fiona?
Shield parallel lines of 8 counters and 3 counters. Ask the students to imagine the extra ones on Karen's line and how many there are. Write 3 + 5 = 8 or 8 - 3 = 5 on the board depending on which way the students solved the problem.
Shielding: Examples. Comparison word stories and recording for: 2 + ? = 7, 8 + ? = 15, 8 + ? = 13, 9 + ? = 15, …
Imaging only: Examples. Comparison word stories and recording for: 10 + ? = 17, 11 + ? = 19, 12 + ? = 16, 16 + ? = 20, …
Using Number Properties
Examples: Comparison word stories and recording for: 77 + ? = 81, 38 + ? = 42, 56 + ? = 64, ? + 87 = 95, …
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