1.CA.5

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 models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; describe the strategy and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones, and that sometimes it is necessary to compose a ten.

I Can Statements Academic Vocabulary

I can add within 100.
I can add a two-digit number and a one-digit number.
I can add a two-digit number and a multiple of 10.
I can use models, drawings, and various other strategies to add within 100.
I can explain strategies used to add within 100.
I can explain that when adding two-digit numbers within 100, I add ones to ones and tens to tens.
I can make a new group of ten when there are more than 10 ones.

Sum
Addend
Addition
Place value
Compose

Looking Back Looking Ahead

Use objects, drawings, mental images, sounds, etc., to represent addition and subtraction within 10. (MA.K.CA.1)

Add and subtract within 1000. (MA.2.CA.4)