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Mental Math Mania Game. Instead of the spinner, I would have the students pick three cards out of a deck or roll three dice.

Second Grade Mental Math Freebie…click on the word "here"

Rounding Match-Up Game {Common Core Aligned 3rd Grade} *FREEBIE*

from Classroom Freebies

Adding on a Hundred Chart

Classroom Freebies: Adding on a Hundred Chart

FREE Place Value Concentration. Fun, hands-on way to teach kids about two-digit numbers.

A kinaesthetic resource for multiplying and dividing by 10, 100 and 1000

FREE Rounding Chart!This free rounding chart helps students to visualize and understand how to round numbers. Great for the common core 3.NBT.1 Use place value understanding to round whole numbers to the nearest 10 or 100.4.NBT.3 Use place value understanding to round multi-digit whole numbers to any place.* I have many FREE products.