How to learn to quickly count examples
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The ability to quickly solve examples is required not only at school or university, but also in everyday situations. For example, when calculating the total cost of goods in a store or planning a family budget.
Instruction manual
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Remember that in order to learn how to quickly solve examples in writing or in your mind, you need constant practice. Buy collections of examples in mathematics and solve two to three dozen daily. Take your time and do not proceed immediately to the next topic if you have not yet refreshed the previous one in your memory. If there are not enough examples, add, subtract, multiply and divide the first numbers that appear. Even if it will be numbers of numbers of nearby cars parked near the house.
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Be sure to write down all your calculations at first, and then check with the calculator. If you find a mistake, solve this example again in order to find out exactly where you made a mistake in the calculations.
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Repeat the multiplication table constantly. Only when you again will easily operate with single-digit numbers, go to double-digit. The easiest way is to divide the multiplier and the factor into tens and ones. For example, 45 × 56 = 45 × 50 + 45 × 6 = 40 × 50 + 5 × 50 + 40 × 6 + 5 × 6 = 2520. With sufficient training, you can solve these examples not only in writing, but also in your mind. The main thing is not to confuse the numbers and follow the procedure. Use the same method when squaring double-digit numbers.
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In order to learn, it turns out that the total will be 4398. If you want to subtract 675 from 3, 723, calculate how much the second number is “not enough” to “round” - 700. That is: 700 - 675 = 25. Subtract 700 from the first number and then add 25. Total: 3048.