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Mathematics, 14.12.2020 18:30 4300402428

Liz estimated 228 + 7 to be between 30 and 40. Which basic facts did she use to help her estimate? Mark all that apply.
A 20 + 5
B 21 - 7
© 28 + 7
D 30 + 5

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Liz estimated 228 + 7 to be between 30 and 40. Which basic facts did she use to help her estimate?...
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