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Lucia knows 2×5 but doesn't know 2×7. How could Sonia use 2×5 to find 2×7?

Lucia knows 2×5 but doesn't know 2×7. How could Sonia use 2×5 to find 2×7?
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3 votes
Lucia knows 2×5 but doesn't know 2×7. How could Sonia use 2×5 to find 2×7?

User Ryanlahue
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1 Answer

5 votes
sonia can calculate that 2x5=10,
2x2=4
4+10=14
User Orolo
by
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