Question
A woman spent $160 on 8 books. The cost of one book is?
- $20
- $15
- $75
- $40
Hint:
20x 8 = 160
The correct answer is: $20
Total books cost = $160
Number of books = 8
8 times ___ number is 160?
8 x 20 = 160
160 ÷ 8 = 20
Each book cost =$20
Cost of 8 books = 160
Cost of 1 book = 160/ 8 = $20
This can be solved by unitary method. This method says that if we know the value of an entity corresponding to a certain value, we can find the value of the same entity corresponding to the multiple of the same value.
Related Questions to study
The _______________ property of addition which states that any number plus zero equals the other number.
the identity property of addition states that any number dded to 0 is equal to the other number.
The _______________ property of addition which states that any number plus zero equals the other number.
the identity property of addition states that any number dded to 0 is equal to the other number.
(5 + 2) + 1 = ____ + (2 + 1)
Associative property of addition says that
(x + y) + z = x + ( y + z )
(5 + 2) + 1 = ____ + (2 + 1)
Associative property of addition says that
(x + y) + z = x + ( y + z )
Find an equivalent expression using the associative property
2 + (3 + 4 ) =
Associative property of addition says that
(x + y) + z = x + ( y + z )
Find an equivalent expression using the associative property
2 + (3 + 4 ) =
Associative property of addition says that
(x + y) + z = x + ( y + z )
This property tells us that the answer does not change when we change the order of numbers when we add.
Commutative property of addition states that the order of numbers in which they are added does not change the value of the expression.
This property tells us that the answer does not change when we change the order of numbers when we add.
Commutative property of addition states that the order of numbers in which they are added does not change the value of the expression.
(1 + 3) + 4 = 1 + (3 + 4)
Associative property of addition says that
(x + y) + z = x + ( y + z )
(1 + 3) + 4 = 1 + (3 + 4)
Associative property of addition says that
(x + y) + z = x + ( y + z )
____________ is an example of commutative property of addition.
Commutative property of addition states that the order of numbers in which they are added does not change the value of the expression.
____________ is an example of commutative property of addition.
Commutative property of addition states that the order of numbers in which they are added does not change the value of the expression.
___ + 5 = 5 + 9
9 + 5 = 5 + 9
Commutative property is shown by this expression.
___ + 5 = 5 + 9
9 + 5 = 5 + 9
Commutative property is shown by this expression.
Name the property which is represented?
44 + 99 = 99 + 44
Commutative property of addition states that the order of numbers in which they are added does not change the value of the expression.
44 + 99 = 99 + 44 shows that the order of the terms has changed but on calculation, we can see that both LHS and RHS have the same value of 143.
Name the property which is represented?
44 + 99 = 99 + 44
Commutative property of addition states that the order of numbers in which they are added does not change the value of the expression.
44 + 99 = 99 + 44 shows that the order of the terms has changed but on calculation, we can see that both LHS and RHS have the same value of 143.
