Adding Three Numbers is an ice cream themed comprehensive unit that has excellent varied strategies addressing the first grade standard of adding three whole numbers within 20. This unit contains everything you need for your classroom to become proficient with adding three digits including four lesson plans, 25 printable worksheets, activities and lesson summarizers, an animated power point with 45 animated slides an end of unit quiz!

This comprehensive unit addresses the following standards:

1. Understand how to find the sum of three numbers whose sum is less than or equal to 20.

2. Understand that adding three addends in any order does not change the sum. (commutative property of addition)

3. Solve word problems with three whole numbers using objects, drawings and equations.

Lesson one teaches the students how to add three whole numbers within 20 using the strategy of “count on” in order to help them arrive at the answer. The number line worksheets and frog animation within the power point will also help your students tremendously with the knowledge of this skill.

Lesson two addresses the “making tens” strategy and will challenge the students to find two addends in the problem that add to 10, allowing them to add the third addend much more easily by just replacing the ones digit with the third addend. The worksheets that go along with this lesson provide the students with tens frames in order to cement this crucial skill.

Lesson three addresses the “adding doubles” strategy that students have already practiced and further builds upon this task allowing them to find the solution to the three addend problem more easily.

Lesson four gives the students more freedom and allows them to “choose two addends” to add first. Perhaps they find it easiest to add the smallest two digits first and be left with the largest digit to add, or maybe they prefer to add the largest two digits first and only be left with the smallest digit. If there is not a tens fact or doubles fact, they can choose the two addends they add first to help them find their final answer.

Also included in this comprehensive unit:

- Four lesson plans (8 pages) - Four lesson summarizers with writing task

- A 45 slide power point with excellent animations

***********PLUS over 20 printable pages and worksheets including:***********

- Three Addend Dice – practice worksheet with dice counters

- Add Three Numbers – practice worksheet with counters

- Adding Three Numbers – practice with number lines (trace the jumps)

- Add Three Digits – more practice with number lines

- Blank Number Lines – for differentiated instruction or class helpers

- Count On With Three Addends – Add horizontally and/or vertically

- Making Tens to Add – practice with tens frames

- Making More Tens – more practice with tens frames

- Adding Three With Doubles – practice with doubles facts (add vertically)

- Adding Three Addends – practice with doubles facts (add horizontally)

- Three Addends – choose two (add vertically)

- Add Three Numbers – mixed review (add horizontally)

- Three Addend Word Problems – practice

- More Word Problems – more practice

- Addition of Three Addends – solve and color center activity

- Adding Three Digits – fill in the blank H.O.T. center activity

- Three Addends – cut out and fill in the square center or class activity (two pages)

- Three Scoops of Addends – add and color center activity with writing aspect

- Make A Cone – three addend partner or center activity (color and black and white)

- Three Addends Quiz – Nineteen question cumulative assessment (two pages)

Your students will love this ice cream themed comprehensive unit that includes all the strategies they need to succeed with these standards. I guarantee it! They will love the animations in the power point and colorful ice cream cones as well as the fun activities they will get to complete and color on while becoming proficient with this standard!