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Cogito

Grade 2 Math · Chapter 2 · Lesson 4

Practice Worksheet

The Same Object, Two Units

A smaller unit always gives a bigger number.

10 problems · about 13 minutes · 2.MD.A.2

NameDate

Figure — use these to answer the problems

Read the top scale, then the bottom one. Same pencil, two numbers.
centimetres
inches
Pencil length10
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

3 problems

  1. From “Inches and Feet”

    How many inches are in a foot?

    Answer

  2. From “Centimetres and Metres”

    How many centimetres are in a metre?

    Answer

  3. From “Measuring in Centimetres”

    Where should one end of the object go?

    • On the 0.
    • On the 1.
    • On the edge of the ruler.

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. Which gives the bigger number, centimetres or metres?

    • Centimetres.
    • Metres.

  2. Why must you say which unit you used?

    • A number alone does not say how long.
    • Because it is polite.

  3. You measure a desk in inches, then in feet. Which number is bigger?

    • The inches number.
    • The feet number.

Build It Up

The same ideas with more to keep track of.

1 problem

  1. If you swap to a bigger unit, does the number go up or down?

    • Down. You need fewer of them.
    • Up.

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

3 problems

  1. A desk is 3 feet long. How many inches is that?

    Answer

  2. Two Answers

    A stick is measured in centimetres and in metres. Which number is bigger?

    • The centimetres number.
    • The metres number.

  3. A Missing Word

    Ana says her ribbon is "12". Why is that not an answer?

    • She did not say the unit.
    • The number is too small.