Suitable for Grades: 1st Grade, 2nd Grade
CCSS: 1.NBT.C.5, 2.NBT.B.8
CCSS Description: Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.
Add ten to a two digit number in these ten questions.
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