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- Solve + and - problems with whole numbers by:
- Using place value partitioning
- Compensating from tidy numbers - including equal additions
- Looking for compatible numbers
- Reversing
- Using algorithm
- Making the best choices about which strategy to use
1. Solve + and - problems by using PLACE VALUE PARTITIONING (PVP)
1. Solve + and - problems by using PLACE VALUE PARTITIONING (PVP)
Book 6
Page 30 - 33
Page 46 - 49
Number Link Y7/8 Book 1
"Firewood Fever" Page 16
"Space Zapper" Page 8
"Fundraiser" Page 6
TASK 1: Show it!
TASK 1: Show it!
Solve these problems using PLACE VALUE PARTITIONING:
Solve these problems using PLACE VALUE PARTITIONING:
- 53 + 35 =
- 46 + 67 =
- 54 + 37 =
- 135 + 28 =
- 87 - 34 =
- 95 - 63 =
- 43 - 27 =
- 113 - 35=
TASK 2: Choose it!
TASK 2: Choose it!
Which of these 3 problems would be the best to use the PLACE VALUE PARTITIONING strategy for?
Which of these 3 problems would be the best to use the PLACE VALUE PARTITIONING strategy for?
Record yourself explaining why it would be a good strategy to use for the particular equation.
Record yourself explaining why it would be a good strategy to use for the particular equation.
45 + 67 97 - 45 48 + 65
45 + 67 97 - 45 48 + 65
2. Solve + and - problems by COMPENSATING from TIDY NUMBERS (including equal additions)
2. Solve + and - problems by COMPENSATING from TIDY NUMBERS (including equal additions)
Book 6
Page 34 - 40
Page 41-45
Figure it Out Level 3 Book 2
"Tracking Toroa" Page 1
TASK 1: Show it!
TASK 1: Show it!
Solve these problems using COMPENSATING from TIDY NUMBERS:
Solve these problems using COMPENSATING from TIDY NUMBERS:
- 59 + 35 =
- 46 + 68 =
- 59 + 37 =
- 138 + 28 =
- 88 - 34 =
- 98 - 69 =
- 41 - 27 =
- 111 - 39=
TASK 2: Choose it!
TASK 2: Choose it!
Which of these 3 problems would be the best to use the COMPENSATING from TIDY NUMBERS strategy for?
Which of these 3 problems would be the best to use the COMPENSATING from TIDY NUMBERS strategy for?
Record yourself explaining why it would be a good strategy to use for the particular equation.
Record yourself explaining why it would be a good strategy to use for the particular equation.
65 + 54 98 - 64 46 + 65
65 + 54 98 - 64 46 + 65
TASK 3: Choose it!
TASK 3: Choose it!
Which of these 3 problems would be the best to use the EQUAL ADDITIONS strategy for?
Which of these 3 problems would be the best to use the EQUAL ADDITIONS strategy for?
Record yourself explaining why it would be a good strategy to use for the particular equation.
Record yourself explaining why it would be a good strategy to use for the particular equation.
65 - 24 95 - 66 72 - 29
65 - 24 95 - 66 72 - 29
3. Solve + and - problems by looking for COMPATIBLE NUMBERS
3. Solve + and - problems by looking for COMPATIBLE NUMBERS
Stage 5
Stage 5
Page 38 - 41
Page 38 - 41
TASK 1: Show it!
TASK 1: Show it!
Solve these problems using COMPATIBLE NUMBERS:
Solve these problems using COMPATIBLE NUMBERS:
55 + 34 + 15 =
55 + 34 + 15 =
16 + 17 - 6 =
16 + 17 - 6 =
24 + 12 - 4 + 8 =
24 + 12 - 4 + 8 =
88 - 34 - 18 + 6 =
88 - 34 - 18 + 6 =
54 + 23 + 17 - 4 =
54 + 23 + 17 - 4 =
25 + 7 - 2 + 15 =
25 + 7 - 2 + 15 =
TASK 2: Choose it!
TASK 2: Choose it!
Which of these 3 problems would be the best to use the COMPATIBLE NUMBERS strategy for?
Which of these 3 problems would be the best to use the COMPATIBLE NUMBERS strategy for?
Record yourself explaining why it would be a good strategy to use for the particular equation.
Record yourself explaining why it would be a good strategy to use for the particular equation.
16 + 23 + 15 - 12 12 + 17 + 28 - 8 + 3
16 + 23 + 15 - 12 12 + 17 + 28 - 8 + 3
27 + 13 - 42 + 18 - 15
27 + 13 - 42 + 18 - 15
4. Solve + and - problems by REVERSING
4. Solve + and - problems by REVERSING
Book 6
Page 50 - 51
Solve these problems using REVERSING:
Solve these problems using REVERSING:
? - 14 = 16
? - 14 = 16
? - 23 = 57
? - 23 = 57
? - 17 = 68
? - 17 = 68
? - 34 = 116
? - 34 = 116
? - 17 = 75
? - 17 = 75
? - 56 = 98
? - 56 = 98
5. Solve + and - problems by using ALGORITHM (standard written form)
5. Solve + and - problems by using ALGORITHM (standard written form)
ADDITION
Book 6
Page 82 - 85
SUBTRACTION
Book 6
Page 86 - 89
Solve these problems using ALGORITHM:
Solve these problems using ALGORITHM:
1384 - 269
1384 - 269
2645 + 1983
2645 + 1983
5402 + 3929
5402 + 3929
1907 - 439
1907 - 439
8294 - 4329
8294 - 4329
4084 - 1693
4084 - 1693
6. Choose critically from a range of mental strategies to solve addition and subtraction problems.
6. Choose critically from a range of mental strategies to solve addition and subtraction problems.
Book 6
MENTAL OR WRITTEN?
Page 90 - 91
Page 92 - 99
Book 7.1
Page 18-21
Which strategy or combinations of strategies would be best for these equations? Justify your choice
- 1458 + 2932
- 3 + 9 + 7 - 4
- 491 - 325
- 387 + 417
- 588 + 264
- 1906 - 435
- ? - 56 = 119
- 232 + 466
- 1964 - 342
- 1340 - ? = 489
TASK 1: Which strategy or combinations of strategies would be best for these equations? Justify your choice
TASK 1: Which strategy or combinations of strategies would be best for these equations? Justify your choice
- 1906 - 435
- ? - 56 = 119
- 232 + 466
- 1964 - 342
- 1340 - ? = 489
- 1458 + 2932
- 3 + 9 + 7 - 4
- 491 - 325
- 387 + 417
- 588 + 264
TASK 2: Create a video explaining when to use the following strategies:
TASK 2: Create a video explaining when to use the following strategies:
1. Compensating with Tidy Numbers
1. Compensating with Tidy Numbers
2. Place Value
2. Place Value
3. Reversing
3. Reversing
2. Algorithm
2. Algorithm
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