Page 27 - NUMINO Challenge_B1
P. 27
3 Four Fours
Basic Concepts Inserting Parentheses
First perform the calculations in 100 {6 (5 3) 4} 100 (6 8 4)
parentheses. Next, multiply and
divide. Then add and subtract from 100 (48 4)
left to right. 100 12
88
When an expression has both ( ), { }, perform the calculation inside
( ) first, then perform the calculation inside { }.
When an expression involves a combination of addition, subtraction,
multiplication and division, we get different answers depending on the
position of the parentheses.
32422 10 3 (2 4 2) 2 6
(3 2) 4 2 2 19 3 2 (4 2 2) 9
3 2 (4 2) 2 5
Example Insert ( ) in the following equation once to make it true.
17 5 9 3 2 1
Class Notes
Since you cannot double a whole number to get an answer of 1, you will have to subtract
from 17 to get 1. To get from 5 9 3 2, parentheses should be inserted as
follows: .
Therefore, .
Try It Again Insert ( ) in the following expression once to get the
greatest possible answer.
58623
24 NUMINO Challenge B1
Basic Concepts Inserting Parentheses
First perform the calculations in 100 {6 (5 3) 4} 100 (6 8 4)
parentheses. Next, multiply and
divide. Then add and subtract from 100 (48 4)
left to right. 100 12
88
When an expression has both ( ), { }, perform the calculation inside
( ) first, then perform the calculation inside { }.
When an expression involves a combination of addition, subtraction,
multiplication and division, we get different answers depending on the
position of the parentheses.
32422 10 3 (2 4 2) 2 6
(3 2) 4 2 2 19 3 2 (4 2 2) 9
3 2 (4 2) 2 5
Example Insert ( ) in the following equation once to make it true.
17 5 9 3 2 1
Class Notes
Since you cannot double a whole number to get an answer of 1, you will have to subtract
from 17 to get 1. To get from 5 9 3 2, parentheses should be inserted as
follows: .
Therefore, .
Try It Again Insert ( ) in the following expression once to get the
greatest possible answer.
58623
24 NUMINO Challenge B1
