{"id":5366,"date":"2016-11-17T15:27:23","date_gmt":"2016-11-17T09:57:23","guid":{"rendered":"http:\/\/race4job.com\/blog\/?p=5366"},"modified":"2016-11-17T15:28:58","modified_gmt":"2016-11-17T09:58:58","slug":"mind-maths-4","status":"publish","type":"post","link":"https:\/\/www.race4job.com\/blog\/mind-maths-4\/","title":{"rendered":"Mind Maths"},"content":{"rendered":"

FINDING CUBE OF NUMBERS<\/span><\/p>\n

NUMBERS BETWEEN 10-20<\/span>
\nStudents should remember cubes of 10 numbers.<\/span><\/p>\n

13 <\/sup>\u00a0 = 1<\/span>
\n 23 <\/sup> = 8<\/span>
\n 33 <\/sup> = 27<\/span>
\n 43 <\/sup> = 64<\/span>
\n 53 <\/sup> = 125<\/span>
\n 63 <\/sup> = 216<\/span>
\n 73 <\/sup> = 343<\/span>
\n 83 <\/sup> = 512<\/span>
\n 93 <\/sup> = 729<\/span>
\n 103 <\/sup> = 1000<\/span><\/p>\n

We take an example and understand this method.<\/span><\/p>\n

Let us find the cube of 13 –<\/span><\/p>\n

First write two digits of 13 in the first 2 places<\/span>
\n Write square of 2nd digit (here 3) in the third place and cube of 2nd digit in the fourth place<\/span>
\n 1 \u00a0 \u00a0 \u00a0 \u00a03 \u00a0 \u00a0 \u00a0 \u00a09 \u00a0 \u00a0 \u00a0 27<\/span>
\n Double the middle numbers and add<\/span>
\n 1 \u00a0 \u00a0 \u00a0 \u00a03 \u00a0 \u00a0 \u00a0 \u00a09 \u00a0 \u00a0 \u00a0 \u00a027<\/span>
\n 6 \u00a0 \u00a0 \u00a0 18<\/span>
\n (1) \u00a0 \u00a0(2) \u00a0 \u00a0 (2)<\/span>
\n 2 \u00a0 \u00a0 \u00a0 \u00a01 \u00a0 \u00a0 \u00a0 \u00a09 \u00a0 \u00a0 \u00a0 \u00a07<\/span>
\n \u2234 133 <\/sup> = 2197<\/span><\/p>\n

Let us find the cube of 15 – <\/span><\/p>\n

Square of 5 = 25; cube of 5 = 125<\/span>
\n 1 \u00a0 \u00a0 \u00a0 \u00a05 \u00a0 \u00a0 \u00a0 \u00a0 25 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0125<\/span>
\n Double the middle numbers and add<\/span>
\n 1 \u00a0 \u00a0 \u00a0 5 \u00a0 \u00a0 \u00a0 \u00a0 \u00a025 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 125<\/span>
\n 10 \u00a0 \u00a0 \u00a0 \u00a0 50<\/span>
\n (2) \u00a0 (8) \u00a0 \u00a0 \u00a0 (12)<\/span>
\n 3 \u00a0 \u00a0 \u00a03 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a07 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a05<\/span>
\n \u2234153 <\/sup> = 2197<\/span><\/p>\n

Similarly,<\/span>
\n Cube of 18 –<\/span>
\n 1 \u00a0 \u00a0 \u00a0 \u00a08 \u00a0 \u00a0 \u00a0 \u00a064 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0512<\/span>
\n Double the middle numbers and add<\/span>
\n 1 \u00a0 \u00a0 \u00a0 \u00a0 8 \u00a0 \u00a0 \u00a0 64 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0512<\/span>
\n 16 \u00a0 \u00a0 128<\/span>
\n (4) \u00a0 \u00a0 (24) \u00a0 \u00a0(51)<\/span>
\n 5 \u00a0 \u00a0 \u00a0 \u00a0 8 \u00a0 \u00a0 \u00a0 \u00a0 3 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a02<\/span>
\n \u2234 183 <\/sup> = 5832<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

FINDING CUBE OF NUMBERS NUMBERS BETWEEN 10-20 Students should remember cubes of 10 numbers. 13 \u00a0 = 1 23 = 8 33 = 27 43 = 64 53 = 125 63 = 216 73 = 343 83 = 512 93 = 729 103 = 1000 We take an example and understand this method. Let us […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-5366","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t