Ten more or ten less?
First graders use mental math to count by ten. CCSS.MATH.CONTENT.1.NBT.C.5
Given a two-digit number, mentally find 10 more or 10 less than the
number, without having to count.
Given a two-digit number, mentally find 10 more or 10 less than the
number, without having to count.
Creada por
Hannah Tigercub Wisdom
Estados Unidos
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