Operator precedence in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to correctly add 2 and 3, then multiply by 4.

Javascript

let result = (2 + 3) [1] 4;
console.log(result);

Drag options to blanks, or click blank then click option'

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using + instead of * causes the result to be 5 + 4 = 9, which is incorrect.

Using - or / changes the meaning and result unexpectedly.

Multiplication (*) has higher precedence than addition (+), so (2 + 3) * 4 equals 20.

2fill in blank

medium

Complete the code to get the correct result of 2 + 3 * 4 without parentheses.

Javascript

let result = 2 + 3 [1] 4;
console.log(result);

Drag options to blanks, or click blank then click option'

A+

B/

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using + instead of * causes the operations to be done left to right, which is not correct here.

Using - or / changes the calculation and result.

Multiplication (*) has higher precedence than addition (+), so 3 * 4 is done first, then 2 is added, resulting in 14.

3fill in blank

hard

Fix the error in the expression to get the correct result of 10 minus 2 times 3.

Javascript

let result = 10 [1] 2 * 3;
console.log(result);

Drag options to blanks, or click blank then click option'

A*

B-

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using + instead of - changes the result to 16.

Using * or / here changes the meaning and causes wrong results.

Subtraction (-) is needed to get 10 - 2 * 3. Multiplication happens first, so 2 * 3 = 6, then 10 - 6 = 4.

4fill in blank

hard

Fill both blanks to create an expression that divides 20 by 5 and then adds 3.

Javascript

let result = 20 [1] 5 [2] 3;
console.log(result);

Drag options to blanks, or click blank then click option'

A/

B+

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the operators changes the result.

Using subtraction or multiplication instead of addition changes the meaning.

Division (/) happens before addition (+), so 20 / 5 = 4, then 4 + 3 = 7.

5fill in blank

hard

Fill all three blanks to create an expression that multiplies 4 by 3, subtracts 2, then adds 5.

Javascript

let result = 4 [1] 3 [2] 2 [3] 5;
console.log(result);

Drag options to blanks, or click blank then click option'

A*

B-

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Changing the order of operators changes the result.

Using division instead of multiplication changes the meaning.

Multiplication (*) happens first: 4 * 3 = 12, then subtraction (-) 12 - 2 = 10, then addition (+) 10 + 5 = 15.