MathsheetsMake a worksheet →1.NBT.C.4
Add within 100 by working with tens and ones — and understand why you sometimes make a new ten.
Worksheets for this standard 1 topic
The standard, officially
Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.