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Cogito

Grade 4 Math · Chapter 7 · Lesson 3

Practice Worksheet

Angles Add Together

Two turns side by side make one bigger turn.

10 problems · about 15 minutes · 4.MD.C.7

NameDate

Figure — use these to answer the problems

Two turns, one after the other. Watch the total.
030609012015018030° + 45° = 75°
First turn30
Second turn45
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “Naming and Measuring Angles”

    Is 75 degrees acute or obtuse?

    • Acute.
    • Obtuse.

  2. From “An Angle Is a Turn”

    How many degrees is a half turn?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. A right angle split into 25 and one more part. How big is that part?

    Answer

  2. What happens to angle measures when two angles sit side by side?

    • They add.
    • The bigger one wins.

  3. 35 degrees plus 55 degrees?

    Answer

  4. A right angle split into 20 and one more part. How big is that part?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. A straight angle split into 65 and one more part. How big is that part?

    Answer

  2. 90 degrees plus 90 degrees?

    Answer

Stretch Yourself

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

2 problems

  1. Two Turns

    A 40 degree turn and then a 25 degree turn. How many degrees in all?

    Answerdegrees

  2. The Missing Part

    A straight angle is split into 110 degrees and one more part. How big is that part?

    Answerdegrees