Bridges in Mathematics Grade 4, Unit 7: Reviewing & Extending Fractions Decimals & Multiplication
In this unit, your child revisits the year's biggest ideas and stretches them further. They multiply larger numbers, compare fractions with different denominators, add and subtract mixed numbers, and write fractions with denominators of 10 and 100 as decimals. Pulling these together prepares them for the final unit, a design project that uses measurement, area, and perimeter.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Unit 7?
- Multiplying two-digit numbers, like 46 × 25, with confidence, and choosing between an area model and 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
- Comparing fractions with unlike denominators, like 3/5 and 5/8, using common denominators or the benchmark 1/2. Learn more: Comparing fractions like 2/3 and 5/6
- Adding and subtracting mixed numbers like 3 1/4 − 1 3/4, trading a whole for fourths when needed. Learn more: Adding and subtracting fractions and mixed numbers
- Writing tenths and hundredths as decimals, and placing numbers like 0.4 and 0.62 on a number line. Learn more: Writing fractions as decimals, like 0.62
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
- Compare game scores, like 3 baskets out of 5 against 5 out of 8. Ask your child which is the better result, and have them prove it with a common denominator: 24/40 and 25/40.
- Measure walks in parts of a mile. If you walk 1 1/4 miles one day and 2 3/4 miles the next, ask your child for the total and how much farther the second walk was.
- Read prices aloud as hundredths of a dollar. For $0.35, ask your child to say "thirty-five hundredths," write 35/100, and name coins that make it, like 3 dimes and 1 nickel.
Where kids can get stuck
- Subtracting the smaller fraction from the larger, so 3 1/4 − 1 3/4 comes out as 2 2/4 instead of 1 2/4.
- Changing only the denominator, rewriting 2/3 as 2/6 to compare it with 5/6.
- Treating tens as ones inside a partial product, writing 60 × 30 as 180 instead of 1,800.
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.
- unlike denominators
- Denominators that are different, as in 3/5 and 5/8.
- common denominator
- The same denominator shared by two fractions, which makes them easy to compare or add.
- benchmark fraction
- A familiar fraction, like 1/2 or 1, used to compare other fractions.
- mixed number
- A whole number and a fraction together, like 2 1/4.
- decimal
- A number written with a decimal point, like 0.62, to show parts of a whole.
- hundredth
- One of 100 equal parts of a whole, written 1/100 or 0.01.
Want to help your child master fractions, decimals, and multiplication?
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 Bridges in Mathematics Grade 4 Unit 7 cover?
Bridges in Mathematics Grade 4 Unit 7 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.