Exponents and Powers - Worksheets
CBSE Worksheet-1
CLASS –VII Mathematics (Exponents and Powers)
Choose correct option in questions 1 to 4.
- Find the value of
a) -11664
b) 36
c) 5
d) 25 - Simplify:
a) 7x+3
b) 7x+2
c) 72x
d) 7x-2 - Which is greatest among the following?
a) 82
b) 43
c) 28
d) 32 - Find the value of
a) 2
b) 1
c)3
d) 0 - In (-9)4, the base is _______ and the exponent is 4.
- (-1)4 is equal to ____.
- (ax)y = _____
- What should be added to 2y2 - 4yz - 2z2 to get y2 - 2yz - z2.
- Express the following numbers in the standard form.
a) 5,223,000,000
b) 256,000,000 - Simplify and write the answer in exponentialform.
a) 37÷ 34
b) 58÷ 54 - Find m when
CBSE Worksheet-1
CLASS –VII Mathematics (Exponents and Powers)
Answer key
- a
- b ; { 7x x 72 = 7x+2 ( when bases are same and there is a sign of multiplication in between then the exponents get added) }
- c ; { 82 = 64 , 43 = 64, 28 = 256, 32 = 9 }
- a; { (60 - 20) × (60 + 20) = ( 1 - 1 ) x ( 1 + 1) = (0) x ( 2) = 0 ( any base number with exponent 0 is equal to 1) }
- -9
- 1
- axy ; { in this case exponents will get multiplied }
- (y2 - 2yz - z2 ) - ( 2y2 - 4yz - 2z2)
= y2 - 2yz - z2 - 2y2 +4yz +2z2
= - y2 + 2yz + z2 - a. 5.223 x 109
b) 2.56 x 108 - a) 33 ; { 3 7-4 when the bases are same and there is a sign of division in between then the exonents get subtracted }
b) 54 ;{ 58-4 when the bases are same and there is a sign of division in between then the exonents get subtracted }
2m - 1 = -3
2m = -3 + 1
2m = -2
m = -1