Fact family · 2, 5, 7
The 2, 5, 7 Fact Family
Three numbers, four facts. Know one and you're most of the way to the rest.
The triangle
Why they belong together
Picture 2 red cars and 5 blue cars. That's 7 cars altogether, whichever color you count first. Take the red ones away and 5 are left. Put them back and take the blue ones away, and 2 are left.
Play this family
These facts keep coming back
Free to play · no signup · works on phones, tablets and computers
Quick quiz: does it belong?
Questions
What is the fact family for 2, 5 and 7?
2 + 5 = 7, 5 + 2 = 7, 7 − 2 = 5 and 7 − 5 = 2.
What's the whole in this family?
7. It's the biggest number, the answer to the additions and the starting point of the subtractions.
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