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Cogito

Grade 2 Math · Chapter 2 · Lesson 5

Practice Worksheet

Estimating Length

A good guess uses something you already know.

10 problems · about 12 minutes · 2.MD.A.3

NameDate

Figure — use these to answer the problems

Guess the length first. Then set the ruler and see how close you were.
centimetres
Object length7
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

3 problems

  1. From “The Same Object, Two Units”

    Which gives the bigger number, centimetres or metres?

    • Centimetres.
    • Metres.

  2. From “Inches and Feet”

    How many inches are in a foot?

    Answer

  3. From “Centimetres and Metres”

    How many centimetres are in a metre?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. About how long is one big step?

    • About 1 metre.
    • About 1 centimetre.

  2. Does an estimate have to be exactly right?

    • No. It has to be close.
    • Yes. Always.

  3. A pencil is about how long?

    • About 18 centimetres.
    • About 18 metres.

Build It Up

The same ideas with more to keep track of.

1 problem

  1. A bus is about how long?

    • About 10 metres.
    • About 10 centimetres.

Stretch Yourself

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

3 problems

  1. About how many centimetres wide is your fingernail?

    Answer

  2. The Door

    About how tall is a classroom door?

    • About 2 metres.
    • About 20 metres.
    • About 2 centimetres.

  3. The Spoon

    About how long is a teaspoon?

    • About 12 centimetres.
    • About 1 metre.
    • About 1 centimetre.