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Abakus - Subtraktion
Abakus - Subtraktion
Recent activities in this game
Someone had a problem at level 12. Switch both five and ten To hundreds .
19 hours ago after 1 minute of playing.
Someone got all questions correct at level 12. Switch both five and ten To hundreds .
2025-10-20 19:08 after 2 minutes of playing.
Someone got all questions correct at level 11. Switch both five and ten To tens .
2025-10-20 19:06 after 1 minute of playing.
Someone got all questions correct at level 10. Switch both five and ten To ones .
2025-10-20 19:04 after 2 minutes of playing.
Someone got all questions correct at level 9. Switch ten To hundreds .
2025-10-20 19:03 after 53 seconds of playing.
Someone got all questions correct at level 8. Switch ten To tens .
2025-10-20 19:02 after 1 minute of playing.
Someone got all questions correct at level 7. Switch ten To ones .
2025-10-20 19:01 after 2 minutes of playing.
Someone got all questions correct at level 6. Switch five Hundreds .
2025-10-20 18:58 after 57 seconds of playing.
Someone got all questions correct at level 5. Switch five Tens .
2025-10-20 18:57 after 48 seconds of playing.
Someone got all questions correct at level 4. Switch five Ones .
2025-10-20 18:57 after 1 minute of playing.
Learn how to subtract on the abacus!
Description and game instructions
If you do not already know how to use an abacus you are recommended to play the game Abacus - basics. There you may also find a description of how the abacus is built up and the beads values. If you want to practice plus before minus there's a suitable game called abacus - addition.Difficulties in performing subtraction
When you calculate subtraction on an abacus there are two difficulties you may encounter as described below. There are corresponding levels in this abacus game, to be able to practice them all.Switch five
Carrying five means that there are not enough beads in the lower deck of the rod and you need to switch into a bead with the value of five from the upper deck. It is the same type of switching as when performing addition, but the subtractions you need to know in these calculations are:| -4 = -5 + 1 |
| -3 = -5 + 2 |
| -2 = -5 + 3 |
| -1 = -5 + 4 |
Switch ten
Carrying ten means that there are not enough beads on that rod. Therefore, a bead from the rod to the left need to be switched. Try to make the switch directly - without switching between the two beads above the beam (which each have the value five). You have to master the following additions to perform a carry with the value of ten:| -9 = -10 + 1 | -4 = -10 + 6 |
| -8 = -10 + 2 | -3 = -10 + 7 |
| -7 = -10 + 3 | -2 = -10 + 8 |
| -6 = -10 + 4 | -1 = -10 + 9 |
| -5 = -10 + 5 |
Switch both 5 and 10
This means you have to perform both the switched mentioned above. At first it might be difficult to manage the switches and it's really easy to get lost in an exchange. One tip is to remember the initial value the abacus had so that you can start over just from there, without having to restart the entire round.Calculation of knowledge points
Each completed game level in Abacus - Subtraction gives 1 knowledge points. You can collect a maximum of 12 knowledge points by completing all 12 levels.
In the game Abacus - Subtraction, you can earn a total of 36 medals. Medals are awarded based on how many times you have completed a level:
- Bronze medal: after completing 2 rounds.
- Silver medal: after completing 5 rounds.
- Gold medal: after completing 10 rounds.
Knowledge points are only awarded for levels you have not completed before, meaning those that do not yet have checked green circles. Even after completing a level and earning both knowledge points and medals, you can continue practicing it. However, this will not grant any additional knowledge points or medals.
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Comments
There are a total of 3 comments on this knowledge game.
5 February 2025 17:56
S
23 March 2024 06:41
J
12 February 2022 17:44
