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.
Licence
This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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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