Skill you are practising: Adding doubles

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Add the doubles:

+
=
+

Oh no! That was incorrect!

Correct answer:

Here is an explanation

First, let's check the question

Add the doubles:

+
=
+

Your incorrect answer is:

Next, let's check the solution.

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

1 2 3 4 5 6 7 8 9 10
+ 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10
2 4 6 8 10 12 14 16 18 20


Solution:

+