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Grade 2 Mathematics Week 8 | Student Textbook

Grade 2 | MATHEMATICS

WEEK 8 • STUDENT TEXTBOOK • DAYS 36–40

Read each lesson with a parent or teacher and study the worked example. Then answer the questions for that day in the Week 8 Practice Workbook.

Week 8 Student Textbook | Week 8 Practice Workbook | Week 8 Teacher Guide | Week 7 Student Textbook | Week 9 Student Textbook | Grade 2 index

Day 36: Measure in Inches

An inch is a unit for measuring length. A ruler shows 12 inches. Line up one end of the object with the 0 mark, or the very end of the ruler.

Read the number where the other end of the object stops. If it stops between two numbers, choose the closer number. That is measuring to the nearest inch.

Worked example: A crayon starts at 0 and ends at the 3 on a ruler. How long is it?

  1. The crayon starts at 0.
  2. It ends at 3.
  3. From 0 to 3 is 3 inches.

Worked answer: The crayon is 3 inches long.

Day 37: Centimeters and Meters

A centimeter is a smaller unit of length. Most rulers show inches on one side and centimeters on the other side. A centimeter is about as wide as your little finger.

A meter stick is 100 centimeters long. Use centimeters for small things, like a crayon, and meters for long things, like a room.

Worked example: A paper clip starts at 0 and ends at 3 on the centimeter side of a ruler. How long is it?

  1. Use the centimeter side.
  2. It starts at 0 and ends at 3.
  3. From 0 to 3 is 3 centimeters.

Worked answer: The paper clip is 3 centimeters long.

Day 38: Choose a Tool and Collect Data

Choose the tool that fits the job. Use a 12-inch ruler for small objects. Use a yardstick, which is 3 feet or 36 inches long, for longer things like a table. Use a meter stick for long things in centimeters. Use a measuring tape for things that bend or are very long.

Remember: 12 inches make 1 foot, and 3 feet make 1 yard. Today you will measure ten objects and save the lengths. You will use them in Week 10 to make a line plot.

Worked example: Which tool would you use to measure the length of a couch?

  1. A couch is longer than a 12-inch ruler.
  2. A yardstick or a measuring tape is long enough.

Worked answer: A yardstick or a measuring tape.

Day 39: One Object, Two Units

You can measure the same object in two different units, such as inches and centimeters.

A centimeter is shorter than an inch. It takes more centimeters than inches to cover the same object. So the number of centimeters is always larger than the number of inches.

Worked example: A card is 4 inches long. Is it about 10 centimeters or about 2 centimeters long?

  1. Centimeters are smaller than inches.
  2. So the number of centimeters must be larger than 4.
  3. 10 is larger than 4. 2 is smaller.

Worked answer: About 10 centimeters.

Day 40: Independent Check: Measuring Length

Today you will answer on your own.

Use what you learned this week: start at 0, choose the closer whole unit, pick the right tool, and remember that smaller units give larger numbers.

Worked example: A pencil starts at 0 and ends at 7 on an inch ruler. How long is it?

  1. It starts at 0.
  2. It ends at 7.

Worked answer: 7 inches.

Week 8 Student Textbook | Week 8 Practice Workbook | Week 8 Teacher Guide | Week 7 Student Textbook | Week 9 Student Textbook | Grade 2 index