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.

Q1:

Notice that 3 is one less than 4.

So the answer to 4+3 is one less than the answer to 4+4.

If 4+4=8, which of the following is equal to 4+3?

  • A8−1
  • B4+8
  • C4+4

Q2:

Use

to find

Q3:

Amelia tried to solve 9+8 by using the doubling numbers facts, but she got the answer wrong.

Her teacher circled the mistake in her answer. Help her by finding 9+8.

Q4:

Daniel was asked to solve 6+5.

He wrote

Is his solution correct?

  • AYes
  • BNo

Q5:

Given that 3+3=6, find 3+2.

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 2+1.

Q8:

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

  • ATrue
  • BFalse

Q9:

Daniel and Madison were asked to find 2+1 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 4+5 as shown.

Who is right?

  • ALiam
  • BChloe

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