Solve One-Step Addition and Subtraction Word Problems within 100

Students will read and solve one-step word problems involving addition or subtraction with numbers up to 100. They will identify the operation needed, set up an equation, and find the solution using a variety of strategies.

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Real questions from this skill, graded here. No account, and nothing is saved.

Grade 2 · Addition and Subtraction Word Problems · question 1 of 3

0 of 12

12 rungs. A star at the top.

Ben has 23 stamps in an album. He finds 14 more stamps in a drawer. How many stamps does Ben have now?

How it is taught

0:00 of 4:11

A take-away story needs subtract.

The difference is what is left.

Read it: Count on, count back

There are 38 bulbs. Then 24 more come. Start at 38 on the number line and count on 24: you land on 62.

Find the number the story starts with, and start there.
Count on if more come, and count back if some go.
Read where you land: 38 + 24 = 62.

You already know the first number, so you do not count it again from 1.

Counting on adds the new ones, and counting back takes them away.

When you know the start and the end, count on between them to find the change.

Start at the first number, count on to add or count back to take away, and read where you land.

Starting at 0 and counting all 38 bulbs again.

The 38 are already there. Start at 38, then count on 24.

A shelf has 46 cans. A truck brings 29 more. How many cans now? — 75. Count on 29 from 46: 46 + 29 = 75.

47 − 23 = ?

Maya has forty-seven stickers in her album.

She gives twenty-three of them to her best friend.

How many stickers does Maya have left?

When we give some away, the total goes down. So we subtract.

Let's stack forty-seven on top and twenty-three underneath, lining up the ones and the tens.

Start with the ones column. What is seven minus three?

Four! Write four in the ones place.

Now the tens column. What is four minus two?

Two! Write two in the tens place.

Grade 2 · Maya gives away some of her stickers

Forty-seven minus twenty-three is twenty-four. Maya has twenty-four stickers left!

What you see

While they climb, your page writes one true line to ask about tonight, and a short note each Sunday.

MayaGrade 3 · Mathematics

Did you know?

A chessboard has 64 squares — share them out between the 8 rows and each row holds exactly 8.

Today’s goal: 1 star — one skill mastered, every rung of its ladder climbed
Climbing now: Divide within 100

An example student.

MayaGrade 3 · Mathematics

Maya earned 2 stars this week — Interpret multiplication as equal groups, which took 6 answers over 3 days before its star landed 3 days ago and Multiply by 6, 7, 8 and 9. Next up: Divide within 100.

An example week.

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Standard

CCSS.2.OA.A.1

Use addition and subtraction within 100 to solve one- and two-step word problems

Grade 2

Quoted from the Common Core State Standards.

Where this sits

Comes after

Leads to

What a star here means

A star here is the top of a twelve-rung ladder, in four blocks of equal length — three of facts and one of the skill used in a real question — where a right answer climbs one rung and a wrong one drops back to the start of the block, never below it. The star is kept for good. How we grade

All of Grade 2

This is one rung of 85 in Grade 2 mathematics, in the order they build on each other.

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