Dividing within 100
In 3rd grade, children learn to divide numbers within 100 quickly and accurately, such as 56 ÷ 7 = 8, using the multiplication facts they already know.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
Try these with your child
These are real questions from our 3rd grade practice. Tap the speaker to hear one read aloud, or the light bulb for a hint, and talk about the answer together.
Question 1 of 3
What is 16 ÷ 2?
- 8
- 7
- 14
Why this matters
Dividing with ease lets your child share things out fairly and see how many groups fit, without reaching for counters every time. Quick division facts carry straight into 4th grade, where children divide larger numbers and usually meet remainders for the first time. They also make fractions easier to work with later. At home, it shows up when you split 40 grapes among 5 people, or work out how many 6-packs make 42.
Every division fact starts with a times fact, so knowing the times tables by heart is the place to return to if dividing is slow going.
Where kids can get stuck
- Thinking division works in either order, the way multiplication does, so 3 ÷ 12 and 12 ÷ 3 seem to have the same answer.
- Counting up by 8s and losing track of the jumps, so 72 ÷ 8 comes out as 8 or 10 instead of 9.
- Mixing up 0 and 1 in division, saying 6 ÷ 6 is 0 instead of 1.
How you can help
- Share snacks out fairly. Put 24 crackers on a plate and ask how many each person gets if 4 of you share them, then if 6 of you do, and how they knew.
- Plan with packs at the store. If juice boxes come in packs of 6 and you need 36 for a party, ask your child how many packs to put in the cart.
- Ask division questions in the car, such as how many 5-minute songs fit in a 45-minute drive, or how many $2 snacks you could buy with $16.
Bobby's Math Club offers free practice that grows with your child.
Questions parents ask
Why is my child expected to divide quickly instead of drawing groups?
Drawing groups and sharing out counters is how your child first learned what division means, and that understanding stays. Now the goal is to reach answers like 63 ÷ 9 = 7 without drawing every time, so their attention is free for the problem around it. Quick does not mean rushed. It means your child knows a fact well enough to use it, and can check it with multiplication.
When does my child learn division with remainders?
In 3rd grade, division problems come out evenly, like 48 ÷ 6 = 8. Remainders, as in 17 ÷ 5 = 3 with 2 left over, usually begin in 4th grade. If something at home doesn’t split evenly, such as 13 cookies for 4 people, it is still a nice moment to talk about the leftover one, with no pressure to name it.
My child knows the times tables but freezes on division. What helps?
That’s common, and it isn’t your fault or your child’s. A division fact asks for a times fact backward, and that takes its own practice. Try one table at a time in both directions: after the 4s, ask 28 ÷ 4 and 36 ÷ 4. Give your child time to think rather than rushing. Speed tends to follow once the facts feel connected.
Make learning math fun
Bobby's Math Club turns 3rd grade math practice into something fun to do together.
- Unlimited free practice
- A few minutes a day, at just the right level
- You see their progress and what to work on next
Written by Robert “Bobby” Barnett
Bobby is an award-winning math teacher, the author of Meet Every Learner’s Needs, and the father of two elementary-school math learners. He uses Bobby’s Math Club with his own kids a few times every week. Learn more or contact Bobby.
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Join the clubNote for teachers: This skill is covered by Common Core math standard 3.OA.C.7: “Fluently multiply and divide within 100, using strategies such as the relationship between multiplication and division (e.g., knowing that 8 x 5 = 40 one knows 40 ÷ 5 = 8) or properties of operations. By the end of Grade 3, know from memory all products of two one-digit numbers.” Learn how Bobby's Math Club can help your students grow. (Common Core 3.OA.7)