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This Numbers & Operations in Base Ten - Winter Theme (grade 1) Math Mats is perfect to practice number and operation skills. Your elementary grade students will love this Numbers & Operations in Base Ten - Winter Theme (grade 1) Math Mats. Seven colorful math mats and cards for practice in grouping numbers into tens and ones, and using place value to count, compare, add and subtract. Printable manipulatives are included or you can use real items. CC: Math:L 1.NBT.A.1, B.2-3, C.4-6