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Addition within 40
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Count on to add: 23 + 5
23 + 5 = 28
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Okay!
Use a place value chart to add: 16 + 12
16 + 12 = 28
Oops!
Okay!
Use a place value chart to add: 23 + 12
23 + 12 = 35
Oops!
Okay!
Group into tens and ones to add: 20 + 15
20 + 15 = 35
Oops!
Okay!
Count on to add: 15 + 4
15 + 4 = 19
Oops!
Okay!
Use a place value chart to add: 30 + 3
30 + 3 = 33
Oops!
Okay!
Use a place value chart to add: 23 + 16
23 + 16 = 39
Oops!
Okay!
Group into tens and ones to add: 31 + 4
31 + 4 = 35
Oops!
Okay!
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