IXL | Subtract doubles - up to 10 | 1st grade math

Subtract.

2

–

1

=

ref_doc_title.

Learn with an example

question

Subtract.

10

–

5

=

key idea

To subtract, it can be helpful to think of a related addition fact. (Related facts use the same numbers.)

Related facts
Doubles addition	Doubles subtraction
1 + 1 = 2	2 – 1 = 1
2 + 2 = 4	4 – 2 = 2
3 + 3 = 6	6 – 3 = 3
4 + 4 = 8	8 – 4 = 4
5 + 5 = 10	10 – 5 = 5
6 + 6 = 12	12 – 6 = 6
7 + 7 = 14	14 – 7 = 7
8 + 8 = 16	16 – 8 = 8
9 + 9 = 18	18 – 9 = 9
10 + 10 = 20	20 – 10 = 10

solution

Look at the subtraction sentence.

10

–

5

=

Think of the related addition sentence. It uses the same numbers.

5

+

=

10

The doubles addition fact for 5s shows the missing number. It is 5.

5

+

5

=

10

So:

10

–

5

=

5

$Confetti$

Excellent!

Now entering the Challenge Zone—are you ready?

Questions
answeredQuestions

0

Time
elapsedTime

hr	min	sec
00	00	06

SmartScore
out of 100
IXL's SmartScore is a dynamic measure of progress towards mastery, rather than a percentage grade. It tracks your skill level as you tackle progressively more difficult questions. Consistently answer questions correctly to reach excellence (90), or conquer the Challenge Zone to achieve mastery (100)! Learn more

0

Teacher tools

Work it out

Not feeling ready yet? These can help:

Add doubles - sums up to 10

K.1Subtraction facts - up to 10