Subtraction fact · bridge through 10
13 − 4 = 9
Thirteen minus four is nine. This one crosses 10. Taking 4 away in two hops, with a stop at 10, is easier than counting back 4.
See 13 − 4
13 counters, 4 crossed out, 9 left.
Hop back to 10
- Take away 3 first, to land on 10: 13 − 3 = 10.
- 4 is 3 and 1, so there are 1 still to take away.
- 10 − 1 = 9, so 13 − 4 = 9.
Or think addition: 4 + 6 = 10, and 3 more makes 13. That's 6 + 3 = 9 altogether.
Its fact family
4, 9 and 13 go together, so learning one of these helps with all of them. See the family.
Practice 13 − 4 in a game
A fact sticks when a child has to pull it from memory again and again. In this game 13 − 4 keeps coming back between the other facts in its family.
Every round leans on 13 − 4
Free to play · no signup · works on phones, tablets and computers
Quick quiz
13 − 4 FAQ
What is 13 − 4?
13 − 4 = 9. In words: thirteen minus four is nine.
How can I check 13 − 4 = 9?
Add back: 9 + 4 = 13. If the addition gives the number you started with, the subtraction is right.
What grade learns 13 − 4?
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).
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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.
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