Question : Directions: Substitute the arithmetical signs in the place of * in the following equation. 7 * 7 * 2 * 1 = 12
Option 1: ×, –, ÷
Option 2: +, –, ×
Option 3: ×, –, +
Option 4: +, ×, –
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Correct Answer: +, –, ×
Solution : Let's check the option – First option: ×, –, ÷ Equation after replacing the signs ⇒ 7 × 7 – 2 ÷ 1 = 12 Solving the L.H.S. of the equation – = 7 × 7 – 2 ÷ 1 = 7 × 7 – 2 = 49 – 2 = 47 ≠ 12 (L.H.S. ≠ R.H.S.) Second option: +, –, × Equation after replacing the signs ⇒ 7 + 7 – 2 × 1 = 12 Solving the L.H.S. of the equation – = 7 + 7 – 2 × 1 = 7 + 7 – 2 = 12 (L.H.S. = R.H.S.) Third option: ×, –, + Equation after replacing the signs ⇒ 7 × 7 – 2 + 1 = 12 Solving the L.H.S. of the equation – = 7 × 7 – 2 + 1 = 49 – 2 + 1 = 48 ≠ 12 (L.H.S. ≠ R.H.S.) Fourth option: + × – Equation after replacing the signs ⇒ 7 × 7 – 2 + 1 = 12 Solving the L.H.S. of the equation – = 7 + 7 × 2 – 1 = 7 + 14 – 1 = 20 ≠ 12 (L.H.S. ≠ R.H.S.)
So, only the second option satisfies the equation. Hence, the second option is correct.
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Question : Directions: Substitute the correct mathematical symbols in place of * in the following equation. 16 * 4 * 5 * 14 * 6
Option 1: ÷, –, =, ×
Option 2: –, ×, +, =
Option 3: ÷, ×, =, +
Option 4: ÷, +, =, –
Question : Directions: Which two signs must be interchanged to correct the following equation? 35 + 7 × 12 – 6 ÷ 2 = 6
Option 1: – and ×
Option 2: – and ÷
Option 3: + and ×
Option 4: × and ÷
Question : Directions: By Interchanging which two signs the equation will be correct? 21 – 7 × 4 ÷ 10 + 2 = 4
Option 2: × and ÷
Option 3: – and ÷
Option 4: + and –
Question : Directions: Select the correct combination of mathematical signs to replace * signs and balance the following equation. 6 * 4 * 12 * 12
Option 1: +, –, =
Option 2: +, =, ÷
Option 3: =, –, ÷
Option 4: ×, –, =
Question : Directions: Which two signs should be interchanged to make the given equation correct? 7 × 2 + 4 – 6 ÷ 3 = 12
Option 1: × and –
Option 2: = and ×
Option 3: – and +
Option 4: – and =
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