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Grade 2 Mathematics Week 4 | Student Textbook

Grade 2 | MATHEMATICS

WEEK 4 • STUDENT TEXTBOOK • DAYS 16–20

Read each lesson with a parent or teacher and study the worked example. Then answer the questions for that day in the Week 4 Practice Workbook.

Week 4 Student Textbook | Week 4 Practice Workbook | Week 4 Teacher Guide | Week 3 Student Textbook | Week 5 Student Textbook | Grade 2 index

Day 16: Add To and Take From

In some word problems, an amount changes because some are added or some are taken away. Read the problem, find what you know, and find what you need to find.

Write an equation with a box for the unknown number. The unknown can be the start, the change or the result. If 30 birds sat on a wire, some flew away, and 18 were left, the equation is 30 – □ = 18.

Worked example: A shelf held 42 jars. Mom added some more jars. Now there are 57 jars. How many jars did Mom add?

  1. Write the equation: 42 + □ = 57.
  2. Count up from 42 to 57: 42 to 52 is 10, and 52 to 57 is 5.
  3. 10 + 5 = 15.

Worked answer: Mom added 15 jars.

Day 17: Put Together and Take Apart

Some problems have two parts that make a whole. When you know both parts, add to find the whole. When you know the whole and one part, subtract to find the other part.

A part-part-whole drawing helps. Draw a long bar for the whole and split it into two parts. Write the numbers you know and a box for the one you do not know.

Worked example: A garden has 54 flowers. 31 are red and the rest are yellow. How many are yellow?

  1. The whole is 54. One part is 31.
  2. Find the missing part: 54 – 31.
  3. 54 – 31 = 23.

Worked answer: 23 flowers are yellow.

Day 18: Compare: How Many More or Fewer?

Compare problems ask how many more or how many fewer one amount is than another. Find the difference between the two numbers.

Line the two amounts up, or count up from the smaller number to the larger one. If Ava has 52 stickers and Jon has 38, Jon has 14 fewer than Ava, because 38 + 14 = 52.

Worked example: A red tower has 46 blocks. A blue tower has 29 blocks. How many more blocks does the red tower have?

  1. Find the difference: 46 – 29.
  2. Count up from 29: 29 to 30 is 1, and 30 to 46 is 16.
  3. 1 + 16 = 17.

Worked answer: The red tower has 17 more blocks.

Day 19: Two-Step Word Problems

A two-step problem needs two steps of thinking. Solve the first step, then use that answer in the second step. You can write each step as its own equation.

Read the whole problem first. Ask what happened first and what happened next. Draw or write each step.

Worked example: A baker made 40 rolls. She sold 22 in the morning and 9 in the afternoon. How many rolls are left?

  1. Step 1: Rolls sold in all: 22 + 9 = 31.
  2. Step 2: Rolls left: 40 – 31 = 9.

Worked answer: 9 rolls are left.

Day 20: Independent Check: Word Problems

Today you will solve word problems on your own.

Read each problem, decide whether to add or subtract, write an equation, and check that your answer makes sense in the story.

Worked example: There are 63 seats. 48 are filled. How many seats are empty?

  1. The whole is 63 and one part is 48.
  2. 63 – 48 = 15.

Worked answer: 15 seats are empty.

Week 4 Student Textbook | Week 4 Practice Workbook | Week 4 Teacher Guide | Week 3 Student Textbook | Week 5 Student Textbook | Grade 2 index