Reveal Math Grade 4, Unit 12: Measurement
In this unit, your child compares the sizes of units like inches and feet, grams and kilograms, and minutes and hours; converts larger units to smaller ones; and solves word problems with measurement and money. They also use area and perimeter formulas for rectangles. It follows the unit on angles and wraps up fourth grade.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Unit 12?
- Making conversion tables, such as 1 yard = 3 feet = 36 inches, and changing larger units into smaller ones in the same system. Learn more: Converting feet to inches and kilograms to grams
- Solving word problems with distance, time, liquid volume, mass, and money, using all four operations and simple fractions or decimals. Learn more: Story problems about distance, time, and money
- Applying area and perimeter formulas to real rectangles, like a rug or a room, and solving for a missing side. Learn more: Using area and perimeter to solve real problems
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
Amara buys a 5-pound bag of oranges. How many ounces does the bag weigh?
- 60 ounces
- 21 ounces
- 80 ounces
How you can help
- Read the labels on drinks at the store: if a bottle holds 2 liters, ask your child how many milliliters that is, and how many 250-milliliter cups it fills.
- Measure a rug or a doorway with a tape measure and ask your child to give the length in feet and in inches, then find the perimeter.
- Count change after a purchase: if you pay with a $20 bill for something that costs $13.45, ask your child how much change you should get.
Where kids can get stuck
- Dividing instead of multiplying when changing to a smaller unit, so 4 feet turns into a number smaller than 4 instead of 48 inches.
- Lining up money amounts wrongly, treating $20 and $13.45 as 20 and 1,345, which gives a wildly wrong amount of change.
- Multiplying the length and width when a problem asks how much fencing goes around, finding area instead of perimeter.
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
- convert
- To change a measurement to a different unit, like 3 feet to 36 inches.
- yard
- A customary unit of length equal to 3 feet, or 36 inches.
- kilogram
- A metric unit of mass equal to 1,000 grams.
- milliliter
- A small metric unit of liquid volume; 1,000 milliliters make 1 liter.
- mass
- How heavy something is, measured in grams or kilograms.
- liquid volume
- How much liquid a container holds, measured in units like liters or cups.
- area
- The amount of space inside a flat shape, measured in square units.
- perimeter
- The distance all the way around a flat shape.
- formula
- A rule written with letters, such as area = length × width.
Ready to build your child’s confidence with measurement and money?
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 Reveal Math Grade 4 Unit 12 cover?
Reveal Math Grade 4 Unit 12 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.