# 1. Add Multiples of 10

Practice adding 2 multiples of 10. Start with addition using pictorial representation of numbers (base-10 blocks). Then progress to addition using place value understanding, i.e. by adding tens and ones to add numbers.

### Common Core Alignment

**1.NBT.4**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.