3.5.A

Math3rd Grade

The Standard

represent one- and two-step problems involving addition and subtraction of whole numbers to 1,000 using pictorial models, number lines, and equations

Texas Essential Knowledge and Skills for Mathematics

Teacher's field guide

What Students Need to Do: Students read one-step and two-step story problems and decide which quantities are being joined, separated, or compared. They represent the relationships with drawings, number lines, and equations, using numbers through 1,000.
What Mastery Looks Like: Students choose addition or subtraction based on the quantities and identify what each step finds. Their pictorial model, number line, and equation show the same relationships and lead to a reasonable answer.
Common Misconceptions: Students may combine every number using one operation or rely on keywords instead of the situation. They may reverse subtraction, skip the first result in a two-step problem, or write an equation that does not match their model.
How to Assess It: Use this exit ticket: A library had 368 books, received 145 more, then lent out 92. Show the situation with a strip diagram, number line, and equation.

Lesson moves

Give pairs base-ten blocks and a two-step story card, then have them build each step and sketch what they built.
Have students explain in writing how a number line jump matches one part of a two-step story problem.
Play Model Match by having students pair story cards with the correct strip diagrams, number lines, and equations.
Use a classroom supply order and budget to model items added, items used, and the amount remaining.

Keep exploring

Grade, subject, topic, and the complete standard are prefilled. Create one free, no account needed.