The number produced is 15, which is the answer. Step 2: Now halve the number 2, which makes it the number 1.Step 1: Subtract one from the number being multiplied by 5, in this instance the number 3 becomes the number 2.When multiplying an odd number times 5, the formula is a bit different. Step 2: Add a zero to the number to find the answer.Step 1: Take the number being multiplied by 5 and cut it in half, this makes the number 4 become the number 2.When multiplying the number 5 by an even number, there is a quick way to find the answer. Here’s a basic rule to subtract a large number from 1,000: Subtract every number except the last from 9 and subtract the final number from 10 To find the answer to the original equation, 8 must be subtracted from the 890. ![]() Now, add 6 and 2 together for a total of 8 To find the answer to the original equation, it must be determined how much we added to the numbers to round them up. While these numbers are hard to contend with, rounding them up will make them more manageable. ![]() ![]() This method shows how to simplify this process by making all the numbers a multiple of 10. ![]() Adding large numbersĪdding large numbers just in your head can be difficult. Once these strategies are mastered, students should be able to accurately and confidently solve math problems that they once feared solving. Here are 10 fast math strategies students (and adults!) can use to do math in their heads. Fast math tricks infographic 10 tricks for doing fast math
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