Solve addition and subtraction problems by going through tens.
Number Framework Stage 5
Using Materials
Problem: The farmer has 28 cows. She buys some more cows at the market. Now she has 33 cows. How many cows did she buy?
Record 28 + ? = 33 on the board. Tell the students to model 28 cows with 2 tens animal strip and an 8 animal strip. Tell them you want them to make a complete ten by modelling 30 animals. Before they put a strip on students should predict that they need a 2; let them check by doing this. Now ask them to predict what strip they need to reach 33 and check it. Ask how many animals were added on altogether. Record 28 + 5 = 33 on the board
Examples. Word stories and recording for: 7 + ? = 13, 26 + ? = 31, 8 + ? = 13, 18 + ? = 23, 25 + ? = 32, 17 + ? = 24
Using Imaging
Shielding and Imaging Only:
Examples. Word stories and recording for:
17 + ? = 23, 16 + ? = 25, 28 + ? = 35, 14 + ? = 23, 35 + ? = 41, 23 + ? = 31 …
Using Number Properties
Examples. Word stories and recording for: 77 + ? =83, 56 + ? = 65, 68 + ? = 75, 54 +? = 53, 65 +? 71, 22 + ? = 31 ...