Multiply by Pi - Approximation from Number (Level 1)

This math topic focuses on practicing the multiplication of numbers by the approximation of Pi (3.14). It is structured as part of a geometry unit on circle circumferences. The problems involve multiplying single-digit and some two-digit numbers by Pi to find approximate results, with the correct choices provided among multiple alternatives. This helps in understanding and working with the concept of Pi, particularly its application in calculating circle properties such as circumference.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.

Multiply by Pi - Approximation from Number Worksheet

Math worksheet on 'Multiply by Pi - Approximation from Number (Level 1)'. Part of a broader unit on 'Geometry - Circle Circumference - Intro' Learn online: app.mobius.academy/math/units/geometry_circles_perimeter_intro/

1

7 x 3.14 (3.14 = π)

Approximate this number multiplied by Pi (π)

a

38.48

b

21.99

c

28.27

d

11

e

24.5

f

40.84

2

5 x 3.14 (3.14 = π)

Approximate this number multiplied by Pi (π)

a

21.99

b

28.27

c

15.71

d

5

e

7.85

f

34.56

3

2 x 3.14 (3.14 = π)

Approximate this number multiplied by Pi (π)

a

31.42

b

6.28

c

2

d

3.14

e

25.13

f

18.85

4

8 x 3.14 (3.14 = π)

Approximate this number multiplied by Pi (π)

a

50.27

b

32

c

25.13

d

37.7

e

8

f

12.57

5

1 x 3.14 (3.14 = π)

Approximate this number multiplied by Pi (π)

a

3.14

b

0.5

c

0.79

d

28.27

e

1.57

f

9.42

6

6 x 3.14 (3.14 = π)

Approximate this number multiplied by Pi (π)

a

18.85

b

9.42

c

37.7

d

18

e

25.13

f

28.27

7

9 x 3.14 (3.14 = π)

Approximate this number multiplied by Pi (π)

a

34.56

b

9

c

40.5

d

40.84

e

28.27

f

47.12