Use a Double to Add Three Numbers

Before handing out the worksheet, briefly introduce the concept with a short oral warm-up or a visual model on the board. Let students work through the first item together as a class, then finish the rest independently or with a partner, encouraging them to talk through their thinking: "What strategy are you using? How do you know that is right?" After completing the worksheet, review any missed problems together and discuss the reasoning rather than just the answer. For extra support, let students use manipulatives or draw pictures alongside the written problems. These add 3 numbers worksheets work well as daily practice, homework, or a focused review activity.

Add three numbers by solving the double inside first, sums to 20. A double is two of the same number, like 4 + 4. Find the double, add it first, then add the third number. The directions on the page read: Find the double. On the second line, write the double's sum, the other number and the total. Then, write the total on the top line too. The answer key shows every answer.

Yes, both. We made it for 1st Grade addition, and the page works the same whether it lands on a kitchen table or a center rotation. At home, most families go through it together and talk the answers out loud, and that talking is where most of the learning happens with add 3 numbers. In class it runs well as independent work while you pull a small group. Print one copy or thirty, whichever the day needs.

Students look for doubles, pairs that make 10, or start with the largest addend and count on - choosing the most efficient grouping for that set of numbers.

Students discover they can add any two of the three numbers first without changing the result, which is the associative property in concrete action.

Problems involving three groups of objects (e.g., 3 red apples, 4 green apples, and 2 yellow apples - how many altogether?) give real-world context to three-addend addition.

By the end of first grade, students should fluently add within 10 (CCSS 1.OA.C.6) and solve addition problems within 20 using strategies like counting on, making ten, and decomposing numbers. They should also add within 100 using place value understanding (1.NBT.C.4).

Start with adding a two-digit number and a one-digit number, then progress to two two-digit numbers. Use place value understanding: add the tens first, then the ones. Base-ten blocks and place value worksheets make this concrete before moving to abstract equations.

Key strategies include counting on from the larger number, making a ten (e.g., 8+5 becomes 8+2+3), using doubles (6+6=12) and near-doubles (6+7=6+6+1), and decomposing to known facts. Worksheets that practice each strategy separately help students build fluency.