Test: Double Century - 1 - Class 3 MCQ

Let the unknown number be represented by x.

The equation is:

x + 15 = 100

To find x, subtract 15 from both sides of the equation:

x = 100 - 15

So, x = 85. Therefore, the number is 85.

The result of 60 + 40 - 20 can be found step by step:
First, add 60 and 40:
60 + 40 = 100
Then subtract 20 from 100:
100 - 20 = 80
So, the answer is 80.

To solve this, add the two numbers:

45 + 23 = 68

The sum of 45 and 23 is 68, so the correct answer is A: 68.

Let's check each option:

A: 10 × 10 = 100

B: 50 × 3 = 150

C: 25 × 5 = 125

D: 20 × 6 = 120

From the calculations above, the only option that equals 100 is A: 10 × 10.

Let's check each option:

A: 30 + 60 = 90

B: 20 + 80 = 100

C: 40 + 50 = 90

D: 10 + 70 = 80

From the calculations above, the combination that equals 100 is B: 20 + 80.

To solve this, add the two numbers:

77 + 23 = 100

The sum of 77 and 23 is 100, so the correct answer is B: 100.

To solve this, subtract 35 from 100:

100 - 35 = 65

The result of subtracting 35 from 100 is 65, so the correct answer is A: 65.

To solve this, add 17 to 83:

83 + 17 = 100

The sum of 83 and 17 is 100, so the correct answer is C: 100.

To solve this, add the three numbers together:

35 + 25 + 40 = 100

The sum of 35, 25, and 40 is 100, so the correct answer is B: 100.

To solve this, multiply 5 by 20:

5 × 20 = 100

The product of 5 and 20 is 100, so the correct answer is D: 100.