暗算検定 〜かけ暗算編〜

「暗算とは」
筆算やそろばん・計算機などを使わず、頭の中で計算すること。
かけ暗算は、かけ算だけでの問題。
6級〜1級までの問題を出題。
全問正解できるかな？

6〜4級　問題数10問
3級　問題数10問
2級　問題数5問
1級　問題数5問

※問題は独自で考えたもので、日本珠算連盟とは一切関係ありません "What is a mental arithmetic."
The not used, such as calculation by writing and abacus-computer, be calculated in the head.
Over a period of mental arithmetic is, multiplication only in the problem.
Questions the issue of up to 6 to 1 grade class.
Can you do all the questions correct answer?

6 to 4 grade issue number of 10 questions
Tertiary issue number of 10 questions
Grade 2 issue number 5 questions
The number of primary issues 5 questions

※ The problem is that considered proprietary and are not affiliated with Japan Abacus Federation