Computer science · Grades 5–9
Pixel counts
Count the individual picture elements in a rectangular image.
The key idea
Count the individual picture elements in a rectangular image.
pixels = width × height
Worked examples
An image is 320 pixels wide and 300 pixels high. How many pixels does it contain?
320 × 300 = 96000
96000
An image is 200 pixels wide and 280 pixels high. How many pixels does it contain?
200 × 280 = 56000
56000
Try it yourself
An image is 130 pixels wide and 190 pixels high. How many pixels does it contain?
An image is 260 pixels wide and 400 pixels high. How many pixels does it contain?
Check your understanding
Answers and marking notes
- 24700
130 × 190 = 24700
- 104000
260 × 400 = 104000
Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.