Remember: A picture on a screen is a grid of tiny squares called pixels. Each pixel has one color, and more pixels give a clearer picture.
Read and answer
Read the story, then answer.
Zooming in on the heartIt was Gran's birthday, and Teo wanted to make her a card. He drew a pink heart on the computer, and it looked perfect. Mina said, "Zoom in on the heart, and let's see how it is made." Zoom! The edges turned into stairs. Tiny squares of color, and each one is a pixel. Each pixel has just one color, pink or white or another. Together the pixels make a picture, like the tiles in a mosaic. From far away, the squares blend into a smooth heart. Teo tried a tiny grid of four by four squares, and his heart looked like a blocky blob. With eight by eight there was a heart shape, and with sixteen by sixteen the curves looked smoother. More pixels mean more detail. At last Teo made the heart big, with lots of pixels, and printed the card. Gran loved it.
1
This grid is 4 by 4. It has squares in all.
2
How many of the squares in that grid are shaded?
101216
3
An 8 by 8 grid has 8 rows of 8 squares. What goes in the empty box?
81664
4
Each pixel has just one color.
TrueFalse
5
Circle everything on this list that is made of pixels.
🎮a game on a screen✏️a pencil drawing on paper🎬a video on a screen🖼️a painting on canvas📲a drawing on a tablet
6
Teo wants a smoother heart. What should he use?
Fewer, bigger squaresMore, smaller squaresJust one big square
Match, order and fix
7
Join each grid to what it is like.
1a pixel
2a 4 by 4 grid
3an 8 by 8 grid
4a 16 by 16 grid
A64 squares, and a clearer picture
Bone tiny square of color
C256 squares, and a smoother picture
D16 squares, and a blocky picture
8
Put the grids in order, from the blockiest picture to the smoothest.
8 by 8 grid
4 by 4 grid
32 by 32 grid
16 by 16 grid
9
A computer remembers a picture as numbers, made of ones and zeros.
TrueFalse
10
A friend says: zoom in on a screen picture and you will see smooth lines. What is the mix-up to fix?
Up close you see tiny squares called pixelsZooming hides the pixelsA screen picture has no colors
11
Teo's 4 by 4 grid has 16 squares. His 8 by 8 grid has 64 squares. How many more squares is that?
608048
12
Write what you would see if you zoomed in very close on a photo.
13
Color in squares to make a tiny picture, like a heart or a smiley face.
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Answer key · Set A
Teo's heart card
116 A 4 by 4 grid has 4 rows of 4 squares, which is 16 squares.
212 Count each row: 2 + 4 + 4 + 2 = 12 shaded squares. The other 4 are white.
364 An 8 by 8 grid has 64 squares. A 4 by 4 grid has 16, and a 16 by 16 grid has 256.
4True Each pixel is one tiny square with one color, pink or white or another.
5a game on a screen, a video on a screen, a drawing on a tablet A game, a video and a tablet drawing are made of pixels on a screen. A pencil drawing and a painting are not.
6More, smaller squares More pixels mean more tiny squares, so the picture shows more detail.
71-B, 2-D, 3-A, 4-C More squares mean a smoother picture: 16, then 64, then 256.
82, 1, 4, 3 Each bigger grid has more squares and shows more detail.
9True A picture is stored as a long list of numbers, one set for each pixel.
10Up close you see tiny squares called pixels Teo zoomed in and the edges turned into stairs: tiny squares of color.
1148 64 - 16 = 48 more squares.
12Your own words: a grown-up reads it.
Mark each answer, count the right ones and write the score on the sheet.