Solve addition problems to 100 by counting on in their heads.
Number Framework Stage 4
Using Materials
Problem: Michael has 9 sweets in one bag and 2 sweets in another bag. How manysweets does he have altogether?
Write 9 + 2 on the board. Get students to arrange tiles 1 to 9 in order. Shield numbers 10 and 11 in your hand. Ask what are the numbers on the sweets (tiles) in your hand then what does 9 + 2 equal. Then lay down tiles 10, 11 to check the answer is 11.
Complete 9 + 2 = 11 on the board.
Examples. (Second number is 5 or less.) Word problems and recording for: 4 + 2, 7 + 2, 12 + 2, 7 + 3, 12 + 3, 16 + 3....
Using Imaging
Shielding:
Solve 8 oranges plus 4 oranges. Turn the tiles numbered 1 to 8 over to hide the numbers. Hold the next 4 tiles (9 to 12) in your hand and ask the students to imagine what numbers you have. Ask what 8 + 4 equals. If needed fold back turning the 8 tiles over and adding tiles 9 to 12 to the end.
Encourage the students to use their fingers to count on. Write 8 + 4 = 12 on the board.
Examples. Word stories and recording for: 12 + 2, 9 + 2, 11 + 3, 12 + 3, 13 + 3, 8 + 4, 7 + 4, 11 + 5....
Imaging Only:
Examples. Word stories and recording for: 11 + 4, 7 + 2, 13 + 5, 11
+ 5, 18 + 2, 6 + 5, 13 + 5....
Using Number Properties
By increasing the size of the first number in addition problems students are encouraged to let go of the use of materials or imaging and instead concentrate on the properties of the numbers.
Examples. Word stories and recording for: 29 + 4, 46 + 5, 63 + 5, 78 + 3, 34 + 4, 89 + 3....
Challenging examples: 158 + 3, 198 + 5, 212 + 4, 238 + 4, 394 + 5, 117 + 2, 392 + 4....