Question : Directions: Which of the following interchange of numbers and signs would make the given equation correct?
10 − 4 ÷ 20 + 16 × 8 = 16

Option 1: 10 and 16, × and ÷

Option 2: 4 and 8, × and −

Option 3: 4 and 20, + and ÷

Option 4: 10 and 20, + and ×

Question : Directions: By interchanging the given two signs which of the following equations will be not correct?
– and ×

Option 1: 20 × 12 + 6 – 16 ÷ 8 = 20

Option 2: 16 × 91 ÷ 13 + 5 – 3 = 24

Option 3: 20 × 8 – 4 ÷ 2 + 3 = 7

Option 4: 4 × 5 – 36 ÷ 6 + 10 = 10

Question : Directions: Which two signs and two numbers should be interchanged in the following equation to make it correct?
40 – 220 ÷ 2 × 2 + 20 = 200

Option 1: 20 and 40; + and –

Option 2: 2 and 20; ÷ and +

Option 3: 220 and 40; + and ×

Option 4: 220 and 20; ÷ and ×

Question : Find the greatest number that will divide 390, 495, and 300 without leaving a remainder.

Option 1: 5

Option 2: 15

Option 3: 25

Option 4: 35

Question : Simplify the following expression:
[$\sqrt{25}$ + 12 ÷ 3 – {20 + (16 of 8 ÷ 16) – (54 ÷ 18 of $\frac{1}{2}$}]

Option 1: –13

Option 2: 12

Option 3: 22

Option 4: 0