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### Grade 7 - Mathematics4.42 Solving Problems Using Formula for (a+b)(a-b)

 Example: Find the value of 9.2*8.8 using formula. Solution: We can write 9.2*8.8 = (9+0.2)(9-0.2) This is the form of (a+b)(a-b) = a2-b2 = 92-(0.2)2 = 81-0.04 =80.96 Directions: Solve the following problems. Also write at least ten examples of your own.
 Q 1: Find the value of 49.95*50.05 using formula.2499.975249.99752499.9975 Q 2: Find the value of 10.1*9.9 using formula.99.9989.899.9 Q 3: Find the value of 10.01*9.99 using formula.99.999999.9999.999 Q 4: Find the value of 8.1*7.9 using formula.63.9983.9962.99 Question 5: This question is available to subscribers only! Question 6: This question is available to subscribers only!

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