Subtraction fact · plus 0, 1 and 2
11 − 9 = 2
Eleven minus nine is two. 9 and 11 are close together, so counting back 9 would be slow. Find the gap instead.
See 11 − 9
11 counters, 9 crossed out, 2 left.
Count up, not back
- Start at 9, the smaller number.
- Count up to 11: 10, 11.
- That's 2 hops, so 11 − 9 = 2.
Its fact family
2, 9 and 11 go together, so learning one of these helps with all of them. See the family.
Practice 11 − 9 in a game
A fact sticks when a child has to pull it from memory again and again. In this game 11 − 9 keeps coming back between the other facts in its family.
Every round leans on 11 − 9
Free to play · no signup · works on phones, tablets and computers
Quick quiz
11 − 9 FAQ
What is 11 − 9?
11 − 9 = 2. In words: eleven minus nine is two.
How can I check 11 − 9 = 2?
Add back: 2 + 9 = 11. If the addition gives the number you started with, the subtraction is right.
What grade learns 11 − 9?
This is a first and second grade fact. Common Core has children subtract within 20 in first grade (1.OA.C.6) and do it fluently with mental strategies in second grade (2.OA.B.2).
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