Using and explaining addition and subtraction strategies
Using and explaining addition and subtraction strategies
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Lesson details
Key learning points
- In this lesson, we will be learning how to use the most efficient addition and subtraction strategies. We will apply this knowledge to solving addition pyramids.
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5 Questions
Q1.
1. Complete the following equation using your knowledge of number bonds: 74 + _____ = 100
13
2
36
Q2.
2. Use the partitioning strategy to solve the following equation: 34 + 13 =
36
37
46
Q3.
What is the law of commutativity?
A rule which helps us to add by using the column method at all times.
A rule which states that addition and subtraction are the opposite of each other.
A rule which suggests that we should always check our answers using the inverse method.
Q4.
4. Use the round and adjust strategy to solve: 71 + 16 =
78
81
86
Q5.
5. Which strategy would be most appropriate/efficient when solving: 33 + 21 =
Column method
Round and adjust
The rule of commutativity
5 Questions
Q1.
1. Use the 'round and adjust' strategy to solve: 398 + 212.
600
601
620
Q2.
2. Use the 'find the difference by adding on' strategy to complete the equation: 438 + _____ = 620.
160
180
181
Q3.
3. Use the 'partitioning for subtraction' strategy to solve: 487 - 134 =
301
328
377
Q4.
4. Use addition and subtraction to find the missing part of this equation: 124 + ______ + 330 = 754
156
200
209
Q5.
5. Use addition and subtraction to find the missing part of this equation: 389 + ______ + 421 = 924
214
414
814