Jan 8 Math Tricks DPP PDF
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This document provides math tricks for addition and quick calculations. It includes examples such as Trishul Approach for multiplication and addition tricks. These tricks may help students with basic mathematical operations.
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# Trishul Approach ## (2x+2)pi+3)... 1. **12 x 14** - 13^2-1^2 = 168 - 1 = 168 - No. b/w is 13. - gap is `1`. - So 13^2-1^2 2. **51 x 21** - 14^2-1^2 = 195 - No in b/w is 70. - gap from 70 to 67/73 is `2`. - hence `(70)^2 - 8^2` = 4900 - 1= 4899 3. **91 x 89** -...
# Trishul Approach ## (2x+2)pi+3)... 1. **12 x 14** - 13^2-1^2 = 168 - 1 = 168 - No. b/w is 13. - gap is `1`. - So 13^2-1^2 2. **51 x 21** - 14^2-1^2 = 195 - No in b/w is 70. - gap from 70 to 67/73 is `2`. - hence `(70)^2 - 8^2` = 4900 - 1= 4899 3. **91 x 89** - 90^2-1^2 = 8100 - 1 = 8099 ## ADDITION TRICKS a. **nos ending by 0.** 1. 50 + 60 = 110 2. 70 + 80 = 156 3. 50 + 70 = 120 4. 80 + 50 = 180 1. 58 + 60 = 118 2. 76 + 80 = 156 3. 59 + 70 = 129 4. 87 + 50 = 137 ## GAP FROM 100 - 100 - 1 = 99 - 67 + 33 = 100 - 54 + 46 = 100 - 37 + 63 = 100 ## HAL - BHAI APPROACH 1. 23 + 27 = 50 2. 27 + 23 = 50. - write no of tens digits. - singles digit add (sum) to 10. - First 23 + 2 = 50 - then 27 + 3 = 10 - 2 + 3 = 10 ## 1. 576 + 90 = 666. - Add + 1 to 100th 2. 2345 + 90 = 435. - 1 to 10th ## 1. 576 + 197 = 773. - 576 + (200 - 3) - 776 - 3 = 773 2. 345 + 596 = 941. - 345 + (600 - 4) - 945 - 4 = 941 3. 632 + 293 = 925. - 632 + (300 - 7) = 932 - 7 = 925 4. 976 + 398 = 1374. - (976 + 400 - 2) - 1376 - 2 = 1374 ### 1. 65 + 67 = 132. - 65 + (65 + 2) = 130 + 2 2. 174 + 179 = 353 - 175 + (175 + 3) = 353 ### RAM - SHYAM 1. 45 + 54 = 99. - 94 +5 = 9. - now 9 x 11 = 99 ## Long Addition 1. 56 + 65 + 35 + 44 = 200. 2. 44 + 49 = 93 - 45 + (45 + 3) = 93 3. 228 + 235 = 463. - 225 + (225 + 10) + 3 = 463 - 232 + 235 = 467 4. 338 + 83 = 421. - Always multiply by 11 - 5 x 11 = 55 - 11 x 11 = 121 ### 1. Look for 2 nos which add upto 100 - (56 + 44) + (35 + 65) 2. (53 + 47) + ((80.5)^2 - (5.5)^2) = 100 + 167 = 267.
