Placing the cursor to 114 on D, it is seen that the coinciding number on A is 13. As the result is read off on the _left_ scale of A, the number of digits will be (3 × 2) − 1 = 5, and the answer is read as 13,000. The true result is 12,996. EX.—Find the square of 0·0093. The cursor being placed to 93 on D, the number on A is found to be 865. The result is read on the _right_ scale of A, so the number of digits = −2 × 2 = −4, and the answer is read as 0·0000865 [0·00008649]. _Square Root._—The foregoing rules suggest the method of procedure in the inverse operation of extracting the square root of a given number, which will be found on the D scale opposite the number on the A scale. It is necessary to observe, however, that if the number consists of an _odd_ number of digits, it is to be taken on the _left-hand_ portion of the A scale, and the number of digits in the root = (N + 1)/(2), N being the number of digits in the original number. When there is an even number of digits in the number, it is to be taken on the _right-hand_ portion of the A scale, and the root contains _one-half_ the number of digits in the original number. EX.—Find the square root of 36,500. As there is an _odd_ number of digits, placing the cursor to 365 on the L.H. A scale gives 191 on D. By the rule there are (N + 1)/(2) = (5 + 1)/(2) = 3 digits in the required root, which is therefore read as 191 [191·05]. EX.—Find √(0·0098.) Placing the cursor to 98 on the right-hand scale of A (since −2 is an _even_ number of digits), it is seen that the coinciding number on D is 99. As the number of digits in the number is −2, the number of digits in the root will be (−2)/(2) = −1. It will therefore be read as 0·099 [0·09899+]. EX.—Find √(0·098). The number of digits is −1, so under 98 on the left scale of A, we find 313 on D. By the rule the number in the root will be (−1 +1)/(2) = 0, and the root is therefore read as 0·313 [0·313049+]. EX.—Find √(0·149.) As the number of digits (0) is _even_, the cursor is set to 149 on the right-hand scale of A, giving 386 on D. By the rule, the number of digits in the root will be (0)/(2) = 0, and the root will be read as 0·386 [0·38605+]. Another method of extracting the square root, by which more accurate readings may generally be obtained, is by using the C and D scales only, with the slide inverted. If there is an _odd_ number of digits in the number, the _right_ index, or if an even number of digits the _left_ index, of the inverted scale Ɔ is placed so as to coincide with the number on D of which the root is sought. Then with the cursor, the number is found on D which coincides with the same number on Ɔ, which number is the root sought. EX.—Find √(22·2.) Placing the left index of Ɔ to 222 on D, the two equal coinciding numbers on Ɔ and D are found to be 4·71.