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### Grade 8 - Mathematics7.49 Solving using Formula - III

 Example: Using appropriate formula and find the value of 208*192. Solution: We can change the given problem like (200+8)(200-8), This is in the form of (a+b)(a-b), using this formula we can find the value, (200+8)(200-8) = (200)2 - (8)2 = 40,000 - 64 = 39,936 Directions: Solve the following problems using appropriate formula. Also write at least ten examples of your own.
 Q 1: Using appropriate formula and find the value of 715*685.489,785489,795489,765489,775 Q 2: Using appropriate formula and find the value of 850*750.637,700637,600637,500637,400 Q 3: Using appropriate formula and find the value of 515*485.249,785249,775249,765249,755 Q 4: Using appropriate formula and find the value of 1015*985.996,775998,775999,775997,775 Q 5: Using appropriate formula and find the value of 406*394.156,964159,954159,864159,964 Q 6: Using appropriate formula and find the value of 57*43.2,4512,2512,4612,351 Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!