Number System MCQs with Answers & Explanations

Step-by-step solution: 1. Multiply 20 by 12. 2. Break the multiplication into tens and ones for clarity. 3. Combine partial products to get 240.

Step-by-step solution: 1. Multiply 12 by 10. 2. Break the multiplication into tens and ones for clarity. 3. Combine partial products to get 120.

Step-by-step solution: 1. Align the numbers vertically. 2. Subtract the ones, tens, and hundreds to obtain 128. 3. Confirm the result: 204 - 76 = 128.

Step-by-step solution: 1. Add the ones place: 2 + 1. 2. Add the tens and hundreds to get 393. 3. Therefore, 312 + 81 = 393.

Step-by-step solution: 1. Align the numbers vertically. 2. Subtract the ones, tens, and hundreds to obtain 212. 3. Confirm the result: 316 - 104 = 212.

Step-by-step solution: 1. Multiply 19 by 13. 2. Break the multiplication into tens and ones for clarity. 3. Combine partial products to get 247.

Step-by-step solution: 1. Multiply 20 by 17. 2. Break the multiplication into tens and ones for clarity. 3. Combine partial products to get 340.

Step-by-step solution: 1. Add the ones place: 6 + 3. 2. Add the tens and hundreds to get 349. 3. Therefore, 276 + 73 = 349.

Step-by-step solution: 1. Align the numbers vertically. 2. Subtract the ones, tens, and hundreds to obtain 452. 3. Confirm the result: 556 - 104 = 452.

Step-by-step solution: 1. Align the numbers vertically. 2. Subtract the ones, tens, and hundreds to obtain 440. 3. Confirm the result: 540 - 100 = 440.

Step-by-step solution: 1. Add the ones place: 4 + 7. 2. Add the tens and hundreds to get 341. 3. Therefore, 264 + 77 = 341.

Step-by-step solution: 1. Recognize that division asks how many times 15 fits into 180. 2. 180 = 15 * 12. 3. So, 180 / 15 = 12.

Step-by-step solution: 1. Add the ones place: 8 + 9. 2. Add the tens and hundreds to get 357. 3. Therefore, 288 + 69 = 357.

Step-by-step solution: 1. Multiply 23 by 9. 2. Break the multiplication into tens and ones for clarity. 3. Combine partial products to get 207.

Step-by-step solution: 1. Recognize that division asks how many times 11 fits into 99. 2. 99 = 11 * 9. 3. So, 99 / 11 = 9.

Step-by-step solution: 1. Add the ones place: 2 + 1. 2. Add the tens and hundreds to get 213. 3. Therefore, 132 + 81 = 213.

Step-by-step solution: 1. Recognize that division asks how many times 11 fits into 121. 2. 121 = 11 * 11. 3. So, 121 / 11 = 11.

Step-by-step solution: 1. Recognize that division asks how many times 11 fits into 88. 2. 88 = 11 * 8. 3. So, 88 / 11 = 8.

Step-by-step solution: 1. Add the ones place: 6 + 3. 2. Add the tens and hundreds to get 469. 3. Therefore, 396 + 73 = 469.

Step-by-step solution: 1. Align the numbers vertically. 2. Subtract the ones, tens, and hundreds to obtain 164. 3. Confirm the result: 252 - 88 = 164.