enVision Mathematics Grade 4, Topic 4: Use Strategies and Properties to Multiply by 2-Digit Numbers
In this unit, your child multiplies two-digit numbers by each other, like 64 × 38, using area models, partial products, and rounding to estimate. They also solve multi-step story problems that use these products. It extends last unit's work with one-digit multipliers, and leads into dividing by one-digit numbers.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Topic 4?
- Multiplying two-digit numbers like 64 × 38 by drawing an area model and adding the four partial products. Learn more about multiplying large numbers by a one-digit number: Multiplying large numbers by a one-digit number · Learn more about multiplying two two-digit numbers
- Solving story problems that need a product and another step, like finding a total cost and then the change. Learn more: Multi-step story problems and leftovers
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
Beads come in bags of 125. Jamal buys 6 bags to make bracelets. How many beads does he get?
- 620
- 750
- 625
How you can help
- Price a class trip together: 23 students at $15 each. Have your child find 20 × 15 and 3 × 15, add 300 and 45, and check that $345 is near the estimate of $300.
- Draw a rectangle on a napkin and label its sides 34 and 16. Ask your child to split it into four boxes by tens and ones, find each box, and add them to get 544.
- Estimate the eggs in 12 cartons of 18 at the store, then multiply in parts together: 10 × 18 = 180 and 2 × 18 = 36, so 216 eggs.
Where kids can get stuck
- Multiplying only the matching places, so 23 × 45 comes out as 815 instead of 1,035.
- Writing 40 × 20 as 80 instead of 800, treating the tens as if they were ones.
- Lining up partial products like 1,800 and 32 by their left edges, which throws off the total.
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
- partial products
- The smaller products you get by multiplying each place separately, which are then added together.
- area model
- A rectangle split into parts by place value, used to show multiplication or division.
- distributive property
- Breaking a number into parts, multiplying each part, and adding: 6 × 14 = 60 + 24.
- product
- The answer to a multiplication problem.
- estimate
- A close guess, often made with rounded numbers, to check whether an answer makes sense.
- multistep problem
- A word problem that needs more than one calculation to solve.
Ready to build your child’s confidence with multiplying two-digit numbers?
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.
Join the club
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 4 Topic 4 cover?
enVision Mathematics Grade 4 Topic 4 covers these math standards. Each one links to what it means, sample questions, and teaching strategies.
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.