1.NBT.C.4 Worksheets: Add Within 100
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1.NBT.C.4 (Number and Operations in Base Ten): Add within 100, including a two-digit number plus a one-digit number or a multiple of ten.
About this standard
First graders add within 100 using models and place value, including a two-digit number plus a one-digit number or a multiple of ten, and they learn that ones sometimes combine into a new ten. Bundles of ten straws with a few loose ones make the regrouping visible. Start with Two-Digit Addition Without Regrouping, then try Two-Digit Plus One-Digit With Regrouping.
