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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
7.49 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 515*485.
249,775
249,765
249,785
249,755

Q 2: Using appropriate formula and find the value of 1505*1495.
2,239,975
2,259,975
2,229,975
2,249,975

Q 3: Using appropriate formula and find the value of 57*43.
2,451
2,351
2,251
2,461

Q 4: Using appropriate formula and find the value of 1015*985.
997,775
996,775
998,775
999,775

Q 5: Using appropriate formula and find the value of 406*394.
159,954
159,864
156,964
159,964

Q 6: Using appropriate formula and find the value of 650*550.
375,400
375,500
375,450
375,550

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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