Add and subtract numbers mentally, including a three-digit number and ones

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Add and subtract numbers mentally, including a three-digit number and ones – 9
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Add and subtract numbers mentally, including a three-digit number and ones – 8
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Add and subtract numbers mentally, including a three-digit number and ones – 7
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Add and subtract numbers mentally, including a three-digit number and ones – 6
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Add and subtract numbers mentally, including a three-digit number and ones – 5
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Add and subtract numbers mentally, including a three-digit number and ones – 4
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Add and subtract numbers mentally, including a three-digit number and ones – 3
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Add and subtract numbers mentally, including a three-digit number and ones -2
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Add and subtract numbers mentally, including a three-digit number and ones -1
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