enVision Mathematics Grade 3, Topic 10: Multiply by Multiples of 10
In this unit, your child multiplies one-digit numbers by multiples of 10, like 4 × 70 or 6 × 30. They use facts they already know and place value: 4 × 70 is 4 groups of 7 tens, which is 28 tens, or 280. This builds on adding and subtracting within 1,000 and leads into story problems with all four operations.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Topic 10?
- Multiplying numbers like 6 × 30 by thinking 6 groups of 3 tens, which is 18 tens, or 180, with number lines and base-ten drawings. Learn more: Multiplying by tens, like 4 x 70
Sample questions to try together
These are real questions from our 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
3 × 90 is the same as 3 groups of 9 tens. How many tens is that in all?
- 12 tens
- 27 tens
- 270 tens
How you can help
- Count out dimes and ask what 6 dimes are worth (60 cents), then ask what 4 piles of 6 dimes would be worth (240 cents).
- Plan a day out by asking how many minutes are in 3 hours, using 60 minutes in an hour, so 3 × 60 = 180 minutes.
- Use packs of 10 crayons or pencils to show that 4 groups of 20 is 4 × 2 tens, which is 8 tens, or 80.
Where kids can get stuck
- Stopping at the basic fact, so 9 × 30 is answered as 27 instead of 270.
- Writing the wrong number of zeros when the fact ends in zero, so 5 × 80 becomes 40 or 4,000 instead of 400.
- Using an add-a-zero trick without knowing why, so they cannot tell whether 3 × 60 = 180 makes sense.
Practice makes perfect
Bobby's Math Club has practice problems that adapt to your child’s level, each with a detailed explanation and an easy-to-follow video, so your child can build confidence in these skills one step at a time.
Words your child will hear
- multiple of 10
- A number like 20, 50, or 90 that is made of tens and no ones.
- tens
- Groups of 10.
- factor
- One of the numbers you multiply, like 4 and 6 in 4 × 6.
- product
- The total you get by multiplying, like 12 in 3 × 4 = 12.
- place value
- What a digit is worth based on its place, like the 4 in 347 meaning 4 tens.
- hundreds
- The place three spots from the right in a number, worth groups of 100.
Want to help your child master multiplying by multiples of 10?
In Bobby's Math Club, your child practices these skills at just the right level, with a hint when they need one, a clear explanation after every question, and kid-friendly videos. Unlimited practice is free.
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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.
Which math standards does enVision Mathematics Grade 3 Topic 10 cover?
enVision Mathematics Grade 3 Topic 10 covers this math standard. Each one links to what it means, sample questions, and teaching strategies.
- 3.NBT.A.3: Multiply by multiples of 10, like 4 × 70 = 280.
For teachers: Unit names and order vary between editions and districts, so your school’s own materials have the exact sequence. Learn how Bobby's Math Club can help your students grow.