Addition fact · doubles
3 + 3 = 6
Three plus three equals six. 3 + 3 is a double: the same number twice. Doubles are worth knowing by heart, because so many other facts lean on them.
See 3 + 3
3 red and 3 yellow.
It's a double
- See two equal groups of 3.
- An insect has 3 legs on each side: 6 legs in all.
- So 3 + 3 = 6. Say it a few times until it comes without counting.
Its fact family has two facts
3, 3 and 6 go together, so learning one of these helps with all of them. See the family.
Practice 3 + 3 in a game
A fact sticks when a child has to pull it from memory again and again. In this game 3 + 3 keeps coming back between the other facts in its family.
Every round leans on 3 + 3
Free to play · no signup · works on phones, tablets and computers
Quick quiz
3 + 3 FAQ
What is 3 + 3?
3 + 3 = 6. In words: three plus three equals six.
Why is 3 + 3 called a double?
Because both numbers are the same. It has a smaller fact family than most: just 3 + 3 = 6 and 6 − 3 = 3.
What grade learns 3 + 3?
Facts within 10 are a first grade goal: Common Core standard 1.OA.C.6 asks for fluency adding and subtracting within 10.
Is Sumtown really free?
Yes. The whole game plays free in your browser, with no signup, no ads and no time limit. All fourteen mini games are in it. An iPhone app is on its way, and you can read what it will add.
An app is on its way
We're building a Sumtown app for iPhone with the parts that need a real app: offline play for car rides, a town map that remembers how far your child got, and a parent report on every fact. Until then, the whole game is free right here.
Coming soon on theApp Store