Compound conditions inside an if

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Quick Questions

Shade in the A or B circle for each question.

1. Which if checks that age is between 10 and 15 (including both)?

A if (age >= 10 || age <= 15)

B if (age >= 10 && age <= 15)

2. Which if is true when score is OUTSIDE the range 40 to 90?

A if (score < 40 && score > 90)

B if (score < 40 || score > 90)

3. What does this condition do? if (temp > 20 && temp < 30)

A It is true only when temp is between 20 and 30

B It is true for any temp value at all

4. x is 5. What is the result of (x > 3 && x < 4)?

A false

B true

5. x is 5. What is the result of (x < 3 || x > 4)?

A true

B false

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1if (age >= 10 && age <= 15)		A&& is the wrong operator for outside a range. No number is below 0 and above 40 at the same time, so it should be \|\|.
2if (score < 0 \|\| score > 100)		BThe second test is missing the variable name. Each side of && must be a full condition, so it should be age <= 15.
3Use brackets so the OR is checked first, then the result is combined with AND		CRuns when score is outside the range 0 to 100, because either test being true is enough
4Use ! to check that something is NOT true, together with another test		Dif (age >= 10 && (house === "Red" \|\| house === "Blue"))
5if (age >= 10 && <= 15)		Eif (score >= 50 && !isAbsent)
6if (temp < 0 && temp > 40)		FRuns only when age is between 10 and 15 inclusive, because both tests must be true

Definitions

if (age >= 10 && age <= 15)

Fill in the Blanks

Complete each line of code by filling in the missing parts.

let age = 12; if (age >= 10 __ age <= 15) { console.log("In range");

let age = 18; if (age < 10 __ age > 15) { console.log("Outside");

let done = false; if (_done && score >= 50) { console.log("Keep going");

if (isMember && (age < 10 __ age > 15)) { console.log("Special price"); }

let temp = 25; if (temp >= 20 && ____ <= 30) { console.log("Nice day");

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A let age = 12;

B // Is age from 10 to 15?

C if (age >= 10 || age <= 15) {

D console.log('Yes');

E }

Question 2

A let temp = 38;

B if (temp < 5 && temp > 35) {

C console.log('Extreme');

D }

Question 3

A let hour = 14;

B let open = false;

C // Open from 9 to 17

D if (hour >= 9 && < 17) {

E open = true;

F }

Question 4

A if (!isRaining && temp > 20 {

B console.log('Picnic!');

C }

Question 5

A let pts = 85;

B if (80 <= pts <= 100) {

C console.log('A');

D }

Answer Key

Compound conditions inside an if

Section A: Quick Questions

B — if (age >= 10 && age <= 15)

B — if (score < 40 || score > 90)

A — It is true only when temp is between 20 and 30

A — false

A — true

Section B: Match the Pairs

if (age >= 10 && age <= 15) → Runs only when age is between 10 and 15 inclusive, because both tests must be true

if (score < 0 || score > 100) → Runs when score is outside the range 0 to 100, because either test being true is enough

Use brackets so the OR is checked first, then the result is combined with AND → if (age >= 10 && (house === "Red" || house === "Blue"))

Use ! to check that something is NOT true, together with another test → if (score >= 50 && !isAbsent)

if (age >= 10 && <= 15) → The second test is missing the variable name. Each side of && must be a full condition, so it should be age <= 15.

if (temp < 0 && temp > 40) → && is the wrong operator for outside a range. No number is below 0 and above 40 at the same time, so it should be ||.

Section C: Definitions

if (age >= 10 && age <= 15) — A compound condition joins several tests in one if using && (and), the or operator and ! (not). Brackets set the order. Use it for range checks, like age between 10 and 15.

Section D: Fill in the Blanks

let age = 12;
if (age >= 10 && age <= 15) {
  console.log("In range");

let age = 18;
if (age < 10 || age > 15) {
  console.log("Outside");

let done = false;
if (!done && score >= 50) {
  console.log("Keep going");

if (isMember && (age < 10 || age > 15)) {
  console.log("Special price");
}

let temp = 25;
if (temp >= 20 && temp <= 30) {
  console.log("Nice day");

Section E: Spot the Error

C — A range check needs both tests to be true, so it must use &&. With ||, every number passes, because every number is at least 10 or at most 15. It should be: if (age >= 10 && age <= 15) {

B — To test for outside a range, use ||. No temperature can be below 5 and above 35 at the same time, so && is never true. It should be: if (temp < 5 || temp > 35) {

D — Each side of && must be a full test. The second test is missing the variable hour. It should be: if (hour >= 9 && hour < 17) {

A — The closing bracket of the condition is missing. The whole compound condition must sit inside matching brackets before the {. It should be: if (!isRaining && temp > 20) {

B — JavaScript cannot chain comparisons like this. It works out 80 <= pts first, which gives true or false, then compares that with 100. Write two tests joined by &&: if (pts >= 80 && pts <= 100) {