Number Play — Practice Quiz
CBSE · Class 8 · Mathematics
Try a 4-question quiz on Number Play for CBSE Class 8 Mathematics: tap an answer to check it and see why. 69 questions in the full chapter test.
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Quick Quiz: Number Play
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A 2-digit number is multiplied by 8. Which number cannot be the 2-digit number because the product becomes 3-digit?
A cryptarithm uses two different letters for the two digits of a 2-digit number. Which number cannot be used because both digits are the same?
For the expression 320185, what is the difference between the total excess and the total short in the divisibility-by-11 method?
A number has total excess 8 and total short 11 in the divisibility-by-11 method. What does the difference show?
Sample Questions
For the number 320185, which digits are used for the total excess in the divisibility-by-11 method?
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2, 1, 5
1. In the divisibility-by-11 method, the excess comes from place values that are 1 more than a multiple of 11. 2. These are the units, hundreds, and ten-thousands places. 3. For 320185, those digits are 5, 1, and 2. 4. So the correct digits are 2, 1, and 5.
For the number 320185, which digits are used for the total short in the divisibility-by-11 method?
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3, 0, 8
1. In the divisibility-by-11 method, the short comes from place values that are 1 less than a multiple of 11. 2. These are the tens, thousands, and hundred-thousands places. 3. For 320185, those digits are 3, 0, and 8. 4. So the correct digits are 3, 0, and 8.
Which change in the expression a + b - c - d changes the value by an even number?
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Change +b to -b
1. Compare a + b - c - d with a - b - c - d. 2. The change is (a + b - c - d) - (a - b - c - d). 3. This simplifies to 2b. 4. Since 2b is even, changing +b to -b changes the value by an even number.
For the four numbers 43, 37, 672, and 348, what is the parity of 43 + 37 - 672 - 348?
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Even
1. 43 and 37 are both odd, so 43 + 37 is even. 2. 672 and 348 are both even, so 672 + 348 is even. 3. Subtracting an even number from an even number gives an even number. 4. So 43 + 37 - 672 - 348 is even.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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