Abacus

Click on the beads to slide them left or right. Work in base

1s
Red beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed bead
0
2s
Brown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown bead
0
4s
Green beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen bead
0
8s
Blue beadBlue beadBlue beadBlue beadBlue beadBlue beadBlue beadBlue beadBlue beadBlue beadBlue beadBlue beadBlue beadBlue beadBlue bead
0
16s
Yellow beadYellow beadYellow beadYellow beadYellow beadYellow beadYellow beadYellow beadYellow beadYellow beadYellow beadYellow beadYellow beadYellow beadYellow bead
0
32s
Red beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed beadRed bead
0
64s
Brown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown beadBrown bead
0
128s
Green beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen beadGreen bead
0
0

The purpose of this abacus is to introduce KS3 Computing students to different number bases, including binary (base 2) and hexadecimal (base 16). There are separate interactive pages on binary, hexadecimal and a more detailed page on number bases.

Unfortunately your screen is not large enough to display the abacus. If you are using a mobile device, you could try landscape orientation.