Abacus - Subtraction

1
Minus without switching
Ones
2
Minus without switching
Tens
3
Minus without switching
Hundreds
4
Switch five
Ones
5
Switch five
Tens
6
Switch five
Hundreds
7
Switch ten
To ones
8
Switch ten
To tens
9
Switch ten
To hundreds
10
Switch both five and ten
To ones
11
Switch both five and ten
To tens
12
Switch both five and ten
To hundreds
Save
Comment
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Latest events in this game

2018-06-18 14:21: Someone had a problem at level 8. Switch ten To tens which took 18 seconds.
2018-06-18 14:21: Someone had a problem at level 9. Switch ten To hundreds which took 1 minute.
2018-06-16 17:13: Someone had a problem at level 5. Switch five Tens which took 12 seconds.
2018-06-16 17:12: Someone had a problem at level 5. Switch five Tens which took 3 minutes.
2018-06-16 17:09: Someone had a problem at level 4. Switch five Ones which took 19 seconds.
2018-06-16 14:23: Someone had a problem at level 12. Switch both five and ten To hundreds which took 2 minutes.
2018-06-16 14:21: Someone got all questions correct at level 4. Switch five Ones which took 1 minute.
2018-06-16 14:20: Someone got all questions correct at level 3. Minus without switching Hundreds which took 57 seconds.
2018-06-16 14:18: Someone got all questions correct at level 2. Minus without switching Tens which took 52 seconds.
2018-06-16 14:17: Someone got all questions correct at level 1. Minus without switching Ones which took 53 seconds.

Learn how to subtract on the abacus!

learn how to subtract on an 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 level results in 2 knowledge point. The maximum number of points (24 knowledge points) is achieved when you complete all 12 levels. You'll get a bronze medal when you complete a level 2 times and a silver medal after 5 completed rounds. A gold medal will be received after 10 completed rounds. In Abacus - Subtraction, the maximum number of collectable gold medals is 12. You only earn knowledge points for levels that has not been cleared before. A cleared level has a green background above. Even when you have completed a level, you can continue practicing at that level, but it gives you no more knowledge points.

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Additional game information

Game creator
Helpfulgames
Target group
6 years - 15 years
Practices
Logical thinking, Subtraction, Abacus
Updated
2012-04-27
Published
Unique id
17

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Comment Subtract on an abacus


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Helpfulgames
20 June 2018
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