2桁かけ算　#2

2桁の掛け算が暗算でできたら日常生活でも役立つ場面は意外とたくさんあります。頭が柔らかく何でも吸収しやすい小学生のうちに2桁の掛け算を暗算しておくことも、後の大きな財産となるはずです。「2桁かけ算」はシリーズで、すべての2桁の組み合わせを暗算で計算できるようになることを目指します。組み合わせにもいくつかのパターンがあり、今回の「2桁かけ算　#2」はその第2弾です。九九を知っている人なら誰でもその日のうちに習得することが可能なレベルです。最終的にすべての組み合わせの暗算を習得するまでにはそれなりに訓練が必要ですが、クイズアプリで反復することによって、場所を選ぶことなく遊び感覚で算数脳を鍛えることができます。また、計算アプリにありがちなテンキー入力ではなく、正解を選択肢から選ぶだけのシンプルな形式にしましたので、入力の手間も省けます。小学生から社会人まで、幅広い方にご活用いただけるアプリです。「2桁かけ算　#2」では、「十の位の和が10で、一の位が同じ」になる組み合わせの掛け算を暗算でできるように訓練します。解法は簡単です。①「十の位の数同士の積＋一の位の数」②「一の位の数同士の積」答え：①と②をくっつける例）34×74①3×7＋4＝25②4×4＝16答え：2516やり方がわかったら後は習得できるまでひたすら訓練しましょう。それだけで自ずと算数脳が発達し、生活の中で「物事を数字でとらえる」ことも少しずつできるようになるはずです。Scene two-digit multiplication is useful in everyday life when youre in mental arithmetic There are surprisingly a lot.It is also, it should be a great asset after to keep mental arithmetic the two-digit multiplication in one of the elementary school, which is easy to absorb anything soft and head."2-digit multiplication" in the series, we aim to be like a combination of all of the two-digit can be calculated by mental arithmetic.There are several patterns in combination, this time of "two-digit multiplication # 2" is the second series.Anyone who knows the ninety-nine is anyone level that can be learned on the same day.In until you finally master the mental arithmetic of all the combinations you need training in its own way but, by repeating in a quiz app, you can train your math brain in the sense of play without choosing a location.In addition, rather than the all-too numeric keypad input to the calculation application, that it has a simple format of just pick the correct answer from the choices, saves also time of input.From elementary school students to adults, it is an application that can take advantage in a wide range of people.In the "two-digit multiplication # 2", "in place of the sum of ten is 10, one place is the same," and then trained to be in the mental arithmetic multiplication of the combination to be.Solution is simple.① "The number of number between the product + the ones digit of the tens place."② "the product of the number between ones place."Answer: stick the ① and ②Example) 34 × 74①3 × 7 + 4 = 25②4 × 4 = 16Answer: 2516Lets earnestly training to can learn after Once you know the way.It only math brain develops naturally, "taken in a number of things" in life that also you should be able to little by little.