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Subtraction within 20 - One atta Time

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Isabel received three text messages before noon and another two after noon. How many text messages did Isabel receive total?
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12
8
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Result UnknownChange UnknownStart UnknownAdd to
Ex.
2 + 3 = ?
Ex.
2 + ? = 5
Ex.
? + 3 = ?
Take From
Ex.
2 + 3 = ?
Ex.
2 + ? = 5
Ex.
? + 3 = ?
Total UnknownAddend UnknownBoth Addends UnknownPut together/ take apart
Ex.
3 + 2 = ?
Ex.
3 + ? = 5, 5 – 3 = ?
Ex.
5 = 0 + 5, 5 = 5 + 0
5 = 1 + 4, 5 = 4 + 1
5 = 2 + 3, 5 = 3 + 2
Difference UnknownBigger UnknownSmaller UnknownCompare (More)
Ex.
2 + ? = 5
Ex.
2 + 3 = ?
Ex.
5 – 3 = ?
Compare (Less)
Ex.
5 – 2 = ?
Ex.
3 + 2 = ?
Ex.
? + 3 = 5
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