enVision Mathematics Grade 2, Topic 13: More Addition Subtraction and Length
In this unit, your child solves story problems about length and uses number lines to add and subtract within 100. A number line becomes a kind of ruler, where each number is a distance from 0 and each jump is a part of the problem. Next comes data, where measurements and counts are shown on graphs.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Topic 13?
- Solving story problems about lengths, such as how much ribbon is left, and writing the unit with the answer. Learn more: Story problems about length
- Showing numbers as distances from 0 on a number line and making jumps to add and subtract within 100. Learn more: Adding and subtracting on a number line
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
A piece of yarn is 40 cm long. If you add another 30 cm piece to it, what is the total length of the yarn?
- 10 cm
- 70 cm
- 60 cm
How you can help
- Measure two pieces of string, lay them end to end, and ask your child to find the total length before checking with a ruler.
- Draw a number line on the sidewalk with chalk, and have your child jump from 35 forward 6, or back 8, counting the jumps.
- Tell a length story on a walk: "This path is 80 steps long and we've walked 45. How many more steps?" Let your child draw it.
Where kids can get stuck
- Counting the starting mark as a jump, so 35 + 6 lands on 40 instead of 41.
- Jumping right to subtract or left to add on a number line without labels.
- Leaving the unit off the answer, writing 27 instead of 27 inches.
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 in order at equal spaces, used to count, add, and subtract.
- jump
- A move along a number line that shows adding or subtracting.
- equally spaced
- With the same distance between every mark.
- distance
- How far it is from one point to another.
- total length
- How long things are when they are put end to end.
- unknown
- The missing number in a problem, often shown with a box or a question mark.
- equation
- A number sentence with an equal sign, like 9 + 4 = 13.
Ready to build your child’s confidence with length word problems?
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.
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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 2 Topic 13 cover?
enVision Mathematics Grade 2 Topic 13 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.