こんにちは！「100日後にそろばん完全マスター！」の主です。 Youtube12日目の動画「2ケタ×1ケタのかけ算のやり方①」の内容を簡単に解説します。 パート①は、九九に「が」という言葉がつかない時のかけ算のやり方です。 ちなみに、速く答えを出せる「両 ...

こんにちは！「100日後にそろばん完全マスター！」の主です。 第四章のそろばん7級編がついに始まりました！ Youtube31日目の動画「そろばん7級 2桁×2桁のかけ算のやり方」の内容を簡単に解説します。 ちなみに、速く答えを出せる「両落とし」と呼ばれる ...

19 is only 1 away from 20, so you prefer to start by multiplying 20 times 5, which equals 100. Then we need to take away a squadron of 5, because there are actually only 19 squadrons, not 20. 100 take ...

Mastering double-digit multiplication is an essential skill in mathematics. It may seem challenging at first, but with practice and the right methods, it can be easily accomplished. In this article, ...

It's possible to solve some multiplication problems in your head. But sometimes it can help to use other methods instead. These include using visual aids, such as an array or place counters, or by ...