Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
Related Lessons
2nd Grade
Story Problems about Length
Lesson 207
Warm up with a Mystery Math Mistake to find the mistake made in counting up on a number line to subtract. Use visual models to practice adding and subtracting lengths of objects within 100.
2nd Grade
Line Plots
Lesson 208
Warm up with a Mystery Math Mistake to find the mistake made in counting up on a number line to subtract. Notice and wonder to compare a bar graph and a line plot. Measure your own hand span. Create and use a line plot of hand span data to answer questions.
2nd Grade
Compare then Add or Subtract
Lesson 401
Join Mrs. McCartney for a Number Talk with Abracus as we work on Compensation. We'll compare numbers and add or subtract with Springling and T-Pops. I wonder who's strategy will be most efficient?
2nd Grade
Add and Subtract 10s or 100s
Lesson 402
Join Mrs. McCartney for a Number Talk with Abracus as we work on compensation. We'll add or subtract tens or hundreds.
2nd Grade
Find Differences Between Numbers
Lesson 403
Join Mrs. McCartney for a Number Talk with Value Pak as we work on partial sums. We'll find the difference between numbers with Springling.
