Lesson 17 Let's try | Erin's Challenge! I Can Speak Japanese. Contents Library

An abacus is a tool of calculation. A lot of children learn abacus. Once you become good with an abacus, you can calculate very quickly.

First, let's try to put a number on the abacus. This is "0" (zero).

This black mark indicates the "first digit." The first digit is from 1 to 9.

This is "1."

This is "2."

"5" is indicated by an upper counter.

This is "6."

This is "7."

To indicate "10," make the "first digit" into "0," and "tens digit" into "1."

This is "20."

This is "100."

Now let's try some calculations. Let's do "addition." "1+1+1+1+5 = ." When you move a lower counter to add, use the thumb.

When you add the 5 counter, move it with the index finger. The answer is "9."

Then let's do "subtraction." "9-5-4 = ." Use the index finger to subtract.

The answer is "0."

When you use an abacus, sitting up straight is the most important. Pull your chair close to the desk.

Lesson 17Describing Contradictory Ideas - In Class -