Reveal Math Grade 3, Unit 1: Place Value and Addition/Subtraction
In this unit, your child sharpens number sense with three-digit numbers. Children round to the nearest 10 or 100 and add and subtract within 1,000, using place value, the value a digit has because of its spot in the number. Estimating first helps them catch mistakes. The next unit opens the big idea of third grade: multiplication and division.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Unit 1?
- Rounding to the nearest 10 or 100 using a number line, such as finding that 238 is closer to 240 than to 230. Learn more: Rounding to the nearest 10 or 100
- Adding and subtracting within 1,000 using strategies such as counting on, breaking numbers apart by place, and regrouping. Learn more about adding within 1,000: Adding within 1,000 · Learn more about subtracting within 1,000
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
What is 43 rounded to the nearest 10?
- 50
- 40
- 30
How you can help
- Count the steps on a walk to the end of the block or the park, then round the count to the nearest 10 and the nearest 100 together.
- Find how many more: if a book has 312 pages and your child has read 145, ask how many pages are left, and check the answer by adding.
- Play 'close to 1,000': take turns naming a three-digit number, like 640, while the other player says what to add to make exactly 1,000.
Where kids can get stuck
- Rounding to the nearest hundred by looking at the ones digit instead of the tens digit.
- Subtracting the smaller digit from the larger in each place, so 312 - 145 comes out as 233 instead of 167.
- Forgetting both regrouped amounts, so 368 + 257 comes out as 515 instead of 625.
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
- place value
- The value a digit has because of its place, like the 4 in 470 meaning 4 hundreds.
- digit
- One of the symbols 0 through 9 used to write numbers.
- round
- To change a number to a nearby, friendlier number, like 47 to 50.
- nearest ten
- The multiple of 10 closest to a number, like 50 for 47.
- nearest hundred
- The multiple of 100 closest to a number, like 300 for 287.
- regroup
- To trade 10 ones for 1 ten, or 10 tens for 1 hundred, and back.
- estimate
- A close guess, often made by rounding, to check whether an answer makes sense.
- difference
- The answer to a subtraction problem.
Want to help your child master numbers to 1,000?
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 3 Unit 1 cover?
Reveal Math Grade 3 Unit 1 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.