Adding 3 Whole Numbers within 20 Worksheet

About this resource

What's inside this resource

Twenty problems give students focused fluency practice adding three single-digit whole numbers at a time, with every sum landing at 20 or below. Problems like 5 + 2 + 3 and 6 + 8 + 3 are formatted as simple horizontal equations, so students can work straight down the page without extra instructions to decode.

A complete answer key is included on a second page, showing the worked sum for all 20 problems, so the sheet can be used for independent practice, homework, or a quick self-check.

Product description

From the author

This Adding 3 Whole Numbers within 20 Worksheet is a great resource for teachers who want to help their students build their fact fluency. This worksheet can help students practice adding three whole numbers together to find the sum.

In the classroom

Teaching tips & learning objectives

Learning objectives

Students will add three single-digit whole numbers to find sums within 20.

Teaching tips

Use as a short warm-up or exit ticket once students are comfortable adding two addends, as a bridge toward three-addend fluency.
Have students circle the two addends they combine first, reinforcing that addition can be grouped in any order to reach the same sum.
Pair with the included answer key for a quick self-check station or partner-check activity.

Skills covered

Adding three single-digit whole numbers
Addition fact fluency within 20

Good to know

Questions teachers ask about this resource

How many addends does each problem use?

Each of the 20 problems adds three single-digit whole numbers together, with every sum landing at 20 or below.

Is a solutions page included?

Yes, a full solutions page shows the worked sum for all 20 problems, making the sheet suitable for independent practice or a self-check.

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Curriculum

Standards, concepts & topics

Standards

1.OA.C.6 — Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).
2.OA.B.2 — Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers.

Core concepts

Addition within 20
Associative property of addition (grouping three addends)

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Categories this resource belongs to

1st Grade Math Worksheets 2nd Grade Math Worksheets Addition Worksheets For Grade 1 Addition and Subtraction Worksheets Addition and Subtraction Within 20 Addition Within 20

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