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Abakus - Addition

Abakus - Addition

## Recent activities in this game

Someone had a problem at level

*1. Addition without switching Ones*.1 hour ago after 14 seconds of playing.

Someone had a problem at level

*1. Addition without switching Ones*.1 hour ago after 56 seconds of playing.

Someone had a problem at level

*1. Addition without switching Ones*.1 hour ago after 15 seconds of playing.

Someone had a problem at level

*1. Addition without switching Ones*.1 hour ago after 38 seconds of playing.

Someone had a problem at level

*2. Addition without switching Tens*.5 hours ago after 4 minutes of playing.

Someone had a problem at level

*1. Addition without switching Ones*.5 hours ago after 39 seconds of playing.

Someone had a problem at level

*1. Addition without switching Ones*.5 hours ago after 3 seconds of playing.

Someone had a problem at level

*1. Addition without switching Ones*.5 hours ago after 2 minutes of playing.

Someone had a problem at level

*2. Addition without switching Tens*.5 hours ago after 16 minutes of playing.

Someone had a problem at level

*4. Switch five Ones*.20 hours ago after 57 seconds of playing.

Learn addition on 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. A descriptions of how the abacus is built up and the values of the beads, can also be found there. If you want to practice subtraction on an abacus there's a well suited game for that!#### Difficulties in addition

When you calculate addition on an abacus there are three difficulties you may encounter as described below. There are corresponding levels in the game above, to be able to practice all the difficulties individually or many at the same time.##### 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. The additions you need to remember 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.#### Is it possible to cheat with calculating on an abacus?

No, there are no cheating if you want to learn how to use an abacus efficiently. If you are prone to mental arithmetic, you can of course perform the addition in your head and then move the beads to the right positions. But then there is also no point in using the abacus!### Calculation of knowledge points

Each completed game level gives 2 knowledge point in Abacus - Addition. The maximum number of points (24 knowledge points) is achieved when you pass 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 - Addition, 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.### Similar games

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If you find a spelling mistake or something else that should be corrected, feel free to contact the game creator or us at Helpful Games.

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