Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
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
Measuring with Centimeters
Lesson 203
Warm up with a Mystery Math Mistake as you add two 2-digit numbers using a decomposition strategy. What do you know about measurement? Measure with centimeter cubes to find the length of reptiles. Then answer some questions about the length of reptiles by adding and subtracting within 100. Math Mights was adapted from IM K-5 Math™ ©2021 by Illustrative Mathematics®, […]
2nd Grade
Subtract a 1-Digit from a 2-Digit Number
Lesson 111
Decompose numbers to subtract. Engage in a Number Talk focused on subtraction strategies. Can you solve the problem without pencil and paper? Play a fun subtraction game called "Less than 10".
2nd Grade
Differences with 2-Digit Numbers
Lesson 112
Count up or down on an open number line. Explore a subtraction strategy and see if it helps you to subtract. Engage in a Number Talk.
