Add Ones to a 2 Digit Number - 1st Grade Math

Add Ones to a 2 Digit Number Worksheet help kids practice adding a 2 digit number and a 1 digit number. Understand that adding a 1 digit number is the same as increasing the number of ones in a 2 digit number. Starting with addition using pictorial representation of numbers (base-10 blocks), students then move on to addition using place value understanding, i.e. by adding ones.

Common Core Alignment

1.NBT.4Add 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.