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Commutative number sentences I
This task is about missing numbers that make number sentences true.
Question
1
Change answer
a) Find the missing number in each number sentence and write it in the box.
a) Find the missing number in each number sentence and write it in the box.
i) 7 + 6 = 6 +
ii) 23 +
= 46 + 23
iii)
+ 67 = 67 + 75
iv) 87 + 79 =
+ 87
Question
1
Change answer
b) All the number sentences below are true.
Explain how you know they are true without having to add up the numbers.
45 + 63 = 63 + 45
189 + 52 = 52 + 189
364 + 817 = 817 + 364
2,579 + 168 = 168 + 2,579
b) All the number sentences below are true.
Explain how you know they are true without having to add up the numbers.
45 + 63 = 63 + 45
189 + 52 = 52 + 189
364 + 817 = 817 + 364
2,579 + 168 = 168 + 2,579
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Assessment Resource Banks
(
https://arbs.nzcer.org.nz
)