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Doubles - Worksheet 9 - 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
9 + 11 =
2
8 + 9 =
3
7 + 8 =
4
7 + 9 =
5
6 + 8 =
6
4 + 6 =
7
5 + 6 =
8
8 + 9 =
9
9 + 9 =
10
5 + 7 =
11
7 + 7 =
12
8 + 10 =
13
8 + 8 =
14
4 + 6 =
15
6 + 8 =
16
6 + 8 =
17
9 + 9 =
18
8 + 10 =

Answer Key

1. 202. 173. 154. 165. 146. 107. 118. 179. 1810. 1211. 1412. 1813. 1614. 1015. 1416. 1417. 1818. 18

Frequently Asked Questions

How do I download this doubles - worksheet 9 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.