# Lesson Worksheet: Doubles Minus One Mathematics • 1st Grade

In this worksheet, we will practice adding two consecutive numbers with sums up to 20 by finding one less than a doubles fact.

**Q3: **

Amelia tried to solve by using the doubling numbers facts, but she got the answer wrong.

Her teacher circled the mistake in her answer. Help her by finding .

**Q5: **

Given that , find .

**Q6: **

Complete the addition sentence.

**Q7: **

We can use doubles facts to help us add.

What is the double of 2?

Use the doubles fact to find .

**Q8: **

True or False: is 1 less than the double of 2.

- ATrue
- BFalse

**Q9: **

Daniel and Madison were asked to find using doubles fact. Who got the right answer?

- ADaniel
- BMadison

**Q10: **

Pick the correct answer to complete the following.

- A
- B
- C

**Q11: **

Chloe and Liam solved as shown.

Who is right?

- ALiam
- BChloe