So, the result is 86,568.Ĭancellation: A problem in division is, of course, equivalent to a fraction. Similarly, the hundreds digit is 5, the thousands digit 6 (16, carry the 1), and the ten-thousands 7 + 1 carry = 8.
#Mental math calculator plus#
The tens digit is the ones digit plus twice the tens digit (4 + 2 × 1 = 6).
12: This technique is similar to the technique for 11, except that you double the left-hand digit in the sum. The ten thousands digit is 3 (2 + 1 carry). The thousands digit is 0 (2 + 7 + 1 carry = 10 carry the 1). The hundreds digit is 1 (7 + 3 + 1 = 11, so 1 carry the 1). The tens digit is 1 (3 + 8 = 11, so 1 carry the one). The hundreds digit is the sum of the tens digit of the original number and the hundreds digit, and so on. The tens digit is the sum of the ones digit of the original number plus the tens digit of the original number (make a note of the carry). The ones digit is the ones digit of the original number. 11: Multiplying a number by 11 is fairly straightforward. To multiply by 1,000, add three zeroes and so on. To multiply a number by 100, add two zeroes to the end. 10, 100, 1,000 etc.: To multiply a number by 10, take that number and add a zero to the end. 5: To multiply by 5, you can divide by 2 and then multiply by 10 (see below for multiplying by 10). For example, say you're asked to find 31².
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