← Back to Adding Doubles

Doubles - Worksheet 8 - 1st Grade

Hard

Learn doubles facts like 1+1, 2+2, 3+3 (Hard)

18 problems · 10-15 minutes · Skills: addition, doubles strategy

About This Worksheet

This hard-level worksheet contains 18 problems designed for 1st Grade students practicing adding doubles. Hard worksheets feature challenging problems including multi-step questions, missing values, and real-world applications to push students further.

Doubles facts are among the easiest to memorize and serve as anchor facts for solving nearby addition problems quickly.

How to Solve: Worked Example

Example Problem: 8 + 10 = ___
Solution Steps:
  1. This is "doubles plus 2": 10 = 8 + 2.
  2. Start with the double: 8 + 8 = 16.
  3. Add 2 more: 16 + 2 = 18.
Answer: 18
Tip: Doubles plus 2 works great: double the smaller number, then add 2.
1
5 + 5 =
2
9 + 10 =
3
8 + 8 =
4
5 + 6 =
5
7 + 8 =
6
10 + 10 =
7
7 + 9 =
8
7 + 9 =
9
7 + 8 =
10
9 + 11 =
11
9 + 10 =
12
7 + 8 =
13
7 + 8 =
14
6 + 7 =
15
6 + 7 =
16
10 + 10 =
17
5 + 7 =
18
9 + 9 =

Answer Key

1. 102. 193. 164. 115. 156. 207. 168. 169. 1510. 2011. 1912. 1513. 1514. 1315. 1316. 2017. 1218. 18

Frequently Asked Questions

How do I download this doubles - worksheet 8 worksheet?

Click the "Download PDF / Print" button at the top of the worksheet. You can save it as a PDF or print it directly. The answer key will be on a separate page.

How do I find worksheets at different difficulty levels?

Each subtopic has 10 worksheets: Worksheets 1-3 are Easy, 4-7 are Medium, and 8-10 are Hard. Start with Easy worksheets to build confidence, then progress to harder ones.

How many problems are on this worksheet?

This worksheet contains 18 problems. It typically takes 10-15 minutes to complete. An answer key with all solutions is included.