Grade 8Mathpractice16 questions

Transformations

Grade 8: reflection in a line, rotation about a point, translation by a vector, enlargement and scale factor, congruent and similar shapes.

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Free to play. Teams answer on one screen; your phone is the remote. No student devices.

Questions

When a point is reflected in the y-axis, which coordinate changes sign?
- Both coordinates
- Neither coordinate
- The x-coordinate
- The y-coordinate
Show answer
The x-coordinate
The point (2, 3) is reflected in the vertical line x = 4. Where is its image?
- (-2, 3)
- (2, 5)
- (3, 6)
- (6, 3)
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(6, 3)
When a shape is reflected in a mirror line, its image is the same size as the original. (True or false?)
Show answer
True
Which statement is true for any point and its image in a reflection?
- Both are the same distance from the mirror line
- The image always lies on the mirror line
- The image is closer to the mirror line
- The image is twice as far from the mirror line
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Both are the same distance from the mirror line
Which turn about a point is the same as a half turn?
- 180°
- 270°
- 360°
- 90°
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180°
Point (3, 1) is rotated 90° anticlockwise about the origin (0, 0). Where does it land? (Answer out loud)
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(-1, 3)
The centre of rotation is the one point that does not move. (True or false?)
Show answer
True
Translate the point (1, 2) by the vector (3, -4), where 3 is right and -4 is down. Result?
- (-2, 4)
- (-3, 6)
- (4, -2)
- (4, 6)
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(4, -2)
A translation moves (5, 5) to (2, 9). What is the vector? (Answer out loud)
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(-3, 4)
A rectangle 2 cm by 3 cm is enlarged by scale factor 4. What are its new sides?
- 4 cm by 6 cm
- 6 cm by 7 cm
- 8 cm by 12 cm
- 8 cm by 3 cm
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8 cm by 12 cm
An enlargement with a positive scale factor makes the image smaller. The scale factor is…
- between 0 and 1
- exactly 1
- greater than 1
- less than 0
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between 0 and 1
After an enlargement with scale factor 3, every angle in the shape is multiplied by 3. (True or false?)
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False
A line of length 15 cm is the image after enlarging by scale factor 5. What was the original length?
- 10 cm
- 20 cm
- 3 cm
- 75 cm
Show answer
3 cm
Which transformation can change the size of a shape?
- Enlargement
- Reflection
- Rotation
- Translation
Show answer
Enlargement
Two shapes are exactly the same shape and size. What word describes them? (Answer out loud)
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Congruent
Two similar triangles: a 4 cm side in the smaller matches 10 cm in the larger. Scale factor?
- 0.4
- 1.5
- 2.5
- 6
Show answer
2.5

Play it as a game

Ladder ClimbAnswer right to roll the big die. Ladders lift your team up, slides send it back down. First to the top wins.

Paper RaceEvery right answer moves your car. The team in last place gets a double boost.

Three in a RowAnswer right to place your team sticker on a 3×3 board. Three in a row scores +5 and starts a new round.

Line of FourAnswer right to drop a disc in any column. Four of your discs in a line score +5.

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