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ReasoningAges 7-9

Combined sides of polygons

Combine multiple polygons and calculate the total number of straight sides altogether. Review suitability for your learners before teaching.

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Age band:Ages 4-6Ages 7-9

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Worksheet StudioPractice pack · Ages 7-9

Combined sides of polygons

Take your time. Show your thinking.

  1. 1. How many sides are there altogether in 3 nonagons and 1 decagon?

    3 · 1 · Combined sides of polygons

  2. 2. How many sides are there altogether in 2 squares and 1 octagon?

    2 s · 1 · Combined sides of polygons

  3. 3. How many sides are there altogether in 2 nonagons and 1 pentagon?

    2 · 1 · Combined sides of polygons

  4. 4. How many sides are there altogether in 4 octagons and 1 octagon?

    4 · 1 · Combined sides of polygons

  5. 5. How many sides are there altogether in 2 pentagons and 1 triangle?

    2 · 1 · Combined sides of polygons

  6. 6. How many sides are there altogether in 4 decagons and 1 square?

    4 · 1 s · Combined sides of polygons

  7. 7. How many sides are there altogether in 4 decagons and 1 heptagon?

    4 · 1 h · Combined sides of polygons

  8. 8. How many sides are there altogether in 5 squares and 1 pentagon?

    5 s · 1 · Combined sides of polygons

  9. 9. How many sides are there altogether in 1 hexagon and 1 triangle?

    1 h · 1 · Combined sides of polygons

  10. 10. How many sides are there altogether in 3 hexagons and 1 decagon?

    3 h · 1 · Combined sides of polygons

  11. 11. How many sides are there altogether in 3 hexagons and 1 square?

    3 h · 1 s · Combined sides of polygons

  12. 12. How many sides are there altogether in 3 triangles and 1 octagon?

    3 · 1 · Combined sides of polygons
12 questions · Seed 92 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 7-9

Combined sides of polygons

Answers and reasoning. Review before teaching.

  1. 1. How many sides are there altogether in 3 nonagons and 1 decagon?

    37

    Each nonagon has 9 sides and a decagon has 10 sides: 3 × 9 + 10 = 37.

  2. 2. How many sides are there altogether in 2 squares and 1 octagon?

    16

    Each square has 4 sides and a octagon has 8 sides: 2 × 4 + 8 = 16.

  3. 3. How many sides are there altogether in 2 nonagons and 1 pentagon?

    23

    Each nonagon has 9 sides and a pentagon has 5 sides: 2 × 9 + 5 = 23.

  4. 4. How many sides are there altogether in 4 octagons and 1 octagon?

    40

    Each octagon has 8 sides and a octagon has 8 sides: 4 × 8 + 8 = 40.

  5. 5. How many sides are there altogether in 2 pentagons and 1 triangle?

    13

    Each pentagon has 5 sides and a triangle has 3 sides: 2 × 5 + 3 = 13.

  6. 6. How many sides are there altogether in 4 decagons and 1 square?

    44

    Each decagon has 10 sides and a square has 4 sides: 4 × 10 + 4 = 44.

  7. 7. How many sides are there altogether in 4 decagons and 1 heptagon?

    47

    Each decagon has 10 sides and a heptagon has 7 sides: 4 × 10 + 7 = 47.

  8. 8. How many sides are there altogether in 5 squares and 1 pentagon?

    25

    Each square has 4 sides and a pentagon has 5 sides: 5 × 4 + 5 = 25.

  9. 9. How many sides are there altogether in 1 hexagon and 1 triangle?

    9

    Each hexagon has 6 sides and a triangle has 3 sides: 1 × 6 + 3 = 9.

  10. 10. How many sides are there altogether in 3 hexagons and 1 decagon?

    28

    Each hexagon has 6 sides and a decagon has 10 sides: 3 × 6 + 10 = 28.

  11. 11. How many sides are there altogether in 3 hexagons and 1 square?

    22

    Each hexagon has 6 sides and a square has 4 sides: 3 × 6 + 4 = 22.

  12. 12. How many sides are there altogether in 3 triangles and 1 octagon?

    17

    Each triangle has 3 sides and a octagon has 8 sides: 3 × 3 + 8 = 17.

12 questions · Seed 92 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9

Combined sides of polygons

Take your time. Show your thinking.

  1. 1. How many sides are there altogether in 3 nonagons and 1 decagon?

    3 · 1 · Combined sides of polygons

  2. 2. How many sides are there altogether in 2 squares and 1 octagon?

    2 s · 1 · Combined sides of polygons

  3. 3. How many sides are there altogether in 2 nonagons and 1 pentagon?

    2 · 1 · Combined sides of polygons

  4. 4. How many sides are there altogether in 4 octagons and 1 octagon?

    4 · 1 · Combined sides of polygons

  5. 5. How many sides are there altogether in 2 pentagons and 1 triangle?

    2 · 1 · Combined sides of polygons

  6. 6. How many sides are there altogether in 4 decagons and 1 square?

    4 · 1 s · Combined sides of polygons

  7. 7. How many sides are there altogether in 4 decagons and 1 heptagon?

    4 · 1 h · Combined sides of polygons

  8. 8. How many sides are there altogether in 5 squares and 1 pentagon?

    5 s · 1 · Combined sides of polygons

  9. 9. How many sides are there altogether in 1 hexagon and 1 triangle?

    1 h · 1 · Combined sides of polygons

  10. 10. How many sides are there altogether in 3 hexagons and 1 decagon?

    3 h · 1 · Combined sides of polygons

  11. 11. How many sides are there altogether in 3 hexagons and 1 square?

    3 h · 1 s · Combined sides of polygons

  12. 12. How many sides are there altogether in 3 triangles and 1 octagon?

    3 · 1 · Combined sides of polygons
12 questions · Seed 92 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9

Combined sides of polygons

Answers and reasoning. Review before teaching.

  1. 1. How many sides are there altogether in 3 nonagons and 1 decagon?

    37

    Each nonagon has 9 sides and a decagon has 10 sides: 3 × 9 + 10 = 37.

  2. 2. How many sides are there altogether in 2 squares and 1 octagon?

    16

    Each square has 4 sides and a octagon has 8 sides: 2 × 4 + 8 = 16.

  3. 3. How many sides are there altogether in 2 nonagons and 1 pentagon?

    23

    Each nonagon has 9 sides and a pentagon has 5 sides: 2 × 9 + 5 = 23.

  4. 4. How many sides are there altogether in 4 octagons and 1 octagon?

    40

    Each octagon has 8 sides and a octagon has 8 sides: 4 × 8 + 8 = 40.

  5. 5. How many sides are there altogether in 2 pentagons and 1 triangle?

    13

    Each pentagon has 5 sides and a triangle has 3 sides: 2 × 5 + 3 = 13.

  6. 6. How many sides are there altogether in 4 decagons and 1 square?

    44

    Each decagon has 10 sides and a square has 4 sides: 4 × 10 + 4 = 44.

  7. 7. How many sides are there altogether in 4 decagons and 1 heptagon?

    47

    Each decagon has 10 sides and a heptagon has 7 sides: 4 × 10 + 7 = 47.

  8. 8. How many sides are there altogether in 5 squares and 1 pentagon?

    25

    Each square has 4 sides and a pentagon has 5 sides: 5 × 4 + 5 = 25.

  9. 9. How many sides are there altogether in 1 hexagon and 1 triangle?

    9

    Each hexagon has 6 sides and a triangle has 3 sides: 1 × 6 + 3 = 9.

  10. 10. How many sides are there altogether in 3 hexagons and 1 decagon?

    28

    Each hexagon has 6 sides and a decagon has 10 sides: 3 × 6 + 10 = 28.

  11. 11. How many sides are there altogether in 3 hexagons and 1 square?

    22

    Each hexagon has 6 sides and a square has 4 sides: 3 × 6 + 4 = 22.

  12. 12. How many sides are there altogether in 3 triangles and 1 octagon?

    17

    Each triangle has 3 sides and a octagon has 8 sides: 3 × 3 + 8 = 17.

12 questions · Seed 92 · Age guidance, not curriculum certification