Lesson: Adding and Subtracting Numbers up to 100 Mathematics • 1st Grade

In this lesson, we will learn how to solve problems by deciding whether to add or subtract and then completing equations by adding and subtracting within 100.

Lesson Plan

Students will be able to

select the key information in a word problem,
identify language that signals which operation to use to solve a one-step word problem,
write equations to represent one-step word problems,
solve one-step word problems using addition and subtraction.

Lesson Video

Lesson Playlist

02:51
02:50
+4

02:41

Lesson Worksheet

Q1:

14 years ago, Michael was 27 years old and Emma was 42 years old. Find the equation that shows how old Emma is today.

Q2:

Chloe and Olivia are making a robot out of blue and yellow blocks. Chloe has counted out 19 blue blocks. Olivia says they have 39 blocks in total. How many yellow blocks do they have?

Q3:

There were 98 birds in a tree. 36 flew away. How many are left?