Year 1 2D and 3D shapes worksheet answers to download as PDF

These Year 1 2D and 3D shapes worksheet answers give a full worked solution to all 20 questions of the 2D and 3D shapes worksheet. Try each question yourself first, then check your method step by step.

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Answer to Question 1
1. The shape is perfectly round and has no straight sides and no corners, so it is a circle.
2. The shape has 3 straight sides and 3 corners. Any flat shape with 3 sides is a triangle.
3. The shape has 4 straight sides: two long sides and two short sides, with 4 square corners. It is a rectangle.
4. The shape has 4 straight sides that are all the same length and 4 square corners. It is a square.
Answer to Question 2
1. Run your finger along the edge of a triangle and count the straight lines: 1, 2, 3. A triangle has 3 sides (and 3 corners too).
2. Touch each pointy corner of the square and count: 1, 2, 3, 4. A square has 4 corners, one between each pair of sides.
3. A circle is one curved line that goes all the way round. It has no straight sides at all, so the answer is 0 sides and 0 corners.
4. Look down the Sides column of the table: the square has 4 and the rectangle has 4. So the square and the rectangle both have 4 sides.
Answer to Question 3
1. Every face is a square and all the edges are the same length, so the solid is a cube, like a dice.
2. It is round all over, with no flat faces and no edges. It is a sphere, like a ball.
3. It has a circle at the top, a circle at the bottom and a curved side, like a tin. It is a cylinder.
4. It has one circle at the bottom and goes up to a point. It is a cone, like an ice cream cone.
5. It has a flat base and triangle faces that meet at one point at the top. It is a pyramid.
Answer to Question 4
1. Count the flat faces: top, bottom, front, back, left and right. That makes 6 faces.
2. All the faces of a cube are the same size and each one has 4 equal sides, so each face is a square.
3. An edge is where two faces meet. There are 4 edges round the top, 4 round the bottom and 4 going up the sides: 4 + 4 + 4 = 12 edges.
4. A vertex is a corner where edges meet. There are 4 corners on the top and 4 on the bottom: 4 + 4 = 8 vertices.
Answer to Question 5
1. A flat shape with 3 sides is always a triangle. It also has 3 corners.
2. Flat and round with no corners means the shape is a circle.
3. A solid shape that rolls in every direction like a ball is a sphere. A cylinder can roll too, but only one way, and it is not like a ball.
4. A solid with 6 faces that are all squares is a cube. A cuboid also has 6 faces, but some of them are rectangles.
Answer to Question 6
1. The pattern is circle, square, circle, square, circle... The next shape is a square.
2. The pattern is triangle, square, triangle, square, triangle... The next shape is a square.
3. The pattern is circle, circle, triangle, circle, circle... The next shape is a triangle.
Answer to Question 7
1. Each face of a cube has 4 equal sides and 4 square corners, so you would see a square.
2. Stand a cylinder (like a tin of beans) on the table and trace round the bottom: you draw a circle.
3. The flat bottom of a cone is round, so it is a circle. The rest of the cone is curved and goes up to a point.
4. The pyramid in this lesson stands on a base with 4 equal sides, so the base is a square. Its other faces are triangles.
Answer to Question 8
1. A cylinder has two circle faces and one curved side. The tin of beans has exactly this shape.
2. A ball is a sphere. In the table the sphere is the ball of pasta dough.
3. A clock face is flat and round with no corners, so it is a circle.
4. The tin is a cylinder. The flat top of every cylinder is round, so the top of the tin is a circle.
Answer to Question 9
1. 2 + 1 + 1 + 3 = 7 shapes.
2. The cone is best on top, with its pointed top.
3. The cylinder rolls on its side.
4. Cubes and cuboids have flat faces only: 2 + 3 = 5 shapes.
Answer to Question 10
1. A circle.
2. A square.
3. 4 shapes with 3 prints each: 3 + 3 + 3 + 3 = 12 prints.
4. 12 + 2 = 14 prints.
Answer to Question 11
1. A circle is the only flat shape with no corners. The roundabout is round, so the answer is the circle (the roundabout).
2. The sandpit is a square. Count the sides of a square: 1, 2, 3, 4. The sandpit has 4 sides, all the same length.
3. The question tells us the roof of the little house is a triangle shape, so it is a triangle with 3 sides and 3 corners.
4. A football is round all over and rolls in every direction, so it is a sphere.
Answer to Question 12
1. Only the circles: 3.
2. 2 + 2 + 1 = 5.
3. 3 + 5 = 8.
4. Half of 8 is 4. 5 is more than 4. Yes, he is right.
Answer to Question 13
1. The sign is shaped like a cone: a circle at one end and a point at the other. It is a cone.
2. The boxes of sprinkles have 6 square faces, so they are cubes.
3. Each tub has a circle at the top and the bottom and a curved side, so it is a cylinder.
4. Each scoop of ice cream is a ball, and a ball is a sphere. So every one of the 7 scoops is a sphere: the answer is 7 scoops.
Answer to Question 14
1. The question says the bottom of the pyramid is a square, so the base is a square with 4 equal sides.
2. There is one triangle face on each side of the square base. The square has 4 sides, so there are 4 triangle faces.
3. Add the faces: 4 triangle faces + 1 square base = 5 faces in all.
4. The 4 triangle faces meet at 1 point at the top, and the square base has 4 corners. 1 + 4 = 5 vertices.
Answer to Question 15
1. Flat with 4 sides that are all the same length: this is a square.
2. Flat with 4 sides, two long and two short, is a rectangle.
3. A solid with 2 flat circle faces and 1 curved face, like a tin, is a cylinder.
4. A solid with 1 flat face, 1 curved face and 1 point at the top is a cone.
Answer to Question 16
1. After a triangle the pattern starts again, so the 7th shape is a circle.
2. The 8th shape is a square.
3. The 9th shape is a triangle.
4. 12 shapes make 4 repeats. Each repeat has 1 circle. 4 circles.
Answer to Question 17
1. Count the corners of a triangle: 1, 2, 3. The triangle has 3 corners.
2. A square has 4 corners and a rectangle has 4 corners. Together that is 4 + 4 = 8 corners.
3. Add the triangle, the square and rectangle, and the circle: 3 + 8 + 0 = 11 corners. The circle adds nothing because it has no corners.
4. The new triangle brings 3 more corners: 11 + 3 = 14 corners altogether.
Answer to Question 18
1. 6 squares.
2. 6, 12, then 18 is too many. She can make 2 cubes.
3. 2 cubes use 12 squares. 15 − 12 = 3 squares left.
4. 3 cubes need 6 + 6 + 6 = 18 squares.
Answer to Question 19
1. 6 + 8 = 14.
2. 2 × 14 = 14 + 14 = 28.
3. A cube has 8 and a pyramid has 5. The cube has more.
4. 8 − 5 = 3 more.
Answer to Question 20
1. Try 2 squares and 1 triangle: 4 + 4 + 3 = 11. No. Try 1 square and 2 triangles: 4 + 3 + 3 = 10. Yes. So there is 1 square.
2. There are 2 triangles.
3. 4 + 3 + 3 = 10 corners. Correct.
4. 3 squares make 12, 3 triangles make 9, 2 squares and 1 triangle make 11. Only 1 square and 2 triangles makes 10. No.

How to use these Year 1 2D and 3D shapes worksheet answers

First, try every question on the worksheet without looking. Then compare your working with the solution line by line, not only the final answer. When your answer is different, find the first step that changes, because that is where the mistake is. After that, read the matching part of the 2D and 3D shapes lesson again. Finally, check that the method is secure with the quiz or the test.

Also, the Year 1 2D and 3D shapes worksheet answers are available as a PDF, so you can mark printed work quickly. Moreover, all the pages of this chapter work together, so you can move between them at any time. For example, many pupils read the lesson on Monday, practise on Wednesday and test themselves on Friday. In short, these Year 1 2D and 3D shapes worksheet answers show every step, so nothing is left unexplained.