Zearn Math Grade 2, Mission 7: Problem Solving with Length, Money, and Data
In this unit, your child solves problems with length, money, and data. They add and subtract on a number line, count coins and dollars, measure objects and record them on a line plot, and make picture and bar graphs. It builds on equal groups and arrays and leads into the last unit, on time, shapes, and fractions as equal shares.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Mission 7?
- Using a number line to add and subtract lengths within 100, counting jumps rather than tick marks. Learn more: Adding and subtracting on a number line
- Solving money story problems with dollar bills and coins, such as finding the total cost of two items or the change from a dollar. Learn more about solving story problems by counting bills and coins: Solving story problems by counting bills and coins · Learn more about solving story problems about how much money is left
- Measuring objects to the nearest inch and building a line plot that shows how many of each length they found. Learn more: Measuring things and making a line plot
- Making picture graphs and bar graphs from collected data and solving compare problems with them. Learn more: Making and reading picture graphs and bar graphs
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
On a number line from 0 to 10, which number is closest to 0?
- 5
- 1
- 10
How you can help
- Pay for something small with a dollar and ask your child how much change should come back, counting up from the price.
- Measure a set of crayons, spoons, or toy cars to the nearest inch, and make a line plot together. Ask which length showed up most often.
- Make a bar graph of the weather for a week: sunny, cloudy, or rainy. Ask how many more sunny days there were than rainy ones.
Where kids can get stuck
- Counting each coin as one cent, so a quarter, a dime, and a penny seem worth 3¢.
- Counting tick marks instead of jumps on a number line, so 35 + 6 lands on 40, one short of 41.
- Recording a pencil a bit over 5 inches long as 6 inches, rounding up instead of to the nearest inch.
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
- number line
- A line with numbers marked in order, equally spaced.
- cent
- The value of one penny, written 1¢. One hundred cents make a dollar.
- dollar
- Worth 100 cents. It is written with the $ sign, like $1.
- quarter
- A coin worth 25 cents.
- dime
- A small coin worth 10 cents.
- line plot
- A number line with an X for each measurement, to show data.
- bar graph
- A graph that uses bars of different lengths to show and compare amounts.
- data
- Information you collect, like measurements or votes.
Ready to build your child’s confidence with length, money, and data?
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 Zearn Math Grade 2 Mission 7 cover?
Zearn Math Grade 2 Mission 7 covers these math standards. Each one links to what it means, sample questions, and teaching strategies.
- 2.MD.B.6: Represent whole numbers as lengths from 0 on a number line diagram.
- 2.MD.C.8: Solve word problems involving dollar bills, quarters, dimes, nickels, and pennies.
- 2.MD.D.9: Generate measurement data by measuring lengths of several objects.
- 2.MD.D.10: Draw a picture graph and a bar graph to represent a data set with up to four categories.
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.