U2 Addition and subtraction within 10 000 (2)

​U2 Addition and subtraction within 10 000 (2)

2022/11/08​

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1. Find the sum mentally.

a) 86 + 99 =

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1. Find the sum mentally.

b) 39 + 98 =

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1. Find the sum mentally.

c) 97 + 46 =

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1. Find the sum mentally.

d) 24 + 96 =

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1. Find the sum mentally.

e) 79 + 16 =

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1. Find the sum mentally.

f) 37 + 28 =

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1. Find the sum mentally.

g) 68 + 27 =

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1. Find the sum mentally.

h) 88 + 42 =

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1. Find the sum mentally.

i) 94 + 98 =

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1. Find the sum mentally.

j) 43 + 95 =

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2. Find the difference mentally.

a) 34 - 26 =

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2. Find the difference mentally.

b) 36 - 29 =

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2. Find the difference mentally.

c) 62 - 49 =

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2. Find the difference mentally.

d) 53 - 38 =

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2. Find the difference mentally.

e) 72 - 48 =

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2. Find the difference mentally.

f) 81 - 42 =

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2. Find the difference mentally.

g) 97 - 68 =

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2. Find the difference mentally.

h) 94 - 78 =

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2. Find the difference mentally.

i) 96 - 88 =

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2. Find the difference mentally.

j) 93 - 66 =