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Lesson details
Key learning points
- In this lesson, we will be learning how to use different addition strategies (e.g. partitioning, commutativity and rounding and adjusting) in order to solve magic squares.
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