Using and explaining addition strategies

Using and explaining addition strategies

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Lesson details

Key learning points

  1. 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.

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5 Questions

Q1.
1. Complete the following equation using your knowledge of number bonds: 74 + _____ = 100
13
2
Correct answer: 26
36
Q2.
2. Use the partitioning strategy to solve the following equation: 34 + 13 =
36
37
46
Correct answer: 47
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.
Correct answer: A rule which states that you can swap the numbers in an addition/multiplication equation and your answer will remain the same.
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
Correct answer: 87
Q5.
5. Which strategy would be most appropriate/efficient when solving: 33 + 21 =
Column method
Correct answer: Partitioning
Round and adjust
The rule of commutativity

Lesson appears in

UnitMaths / Problem solving with integer addition and subtraction