Proportional Reasoning-1
CBSE · Class 8 · Mathematics
Practice quiz for Proportional Reasoning-1 — CBSE Class 8 Mathematics. MCQs and questions with answers to test your preparation.
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Quick Quiz: Proportional Reasoning-1
0/4Tap an answer to check it instantly. No sign-up needed for these 4.
What is the simplest form of the ratio 24:36?
If 6:8 :: 15:x, find the value of x.
A recipe needs 3 cups of flour for 12 cookies. How many cups of flour are needed for 20 cookies?
Divide ₹150 in the ratio 2:3. How much does each person get?
Sample Questions
Which of the following ratios are equivalent to 4:6? (Select all correct answers)
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2:3, 8:12, 12:18, 16:24
The simplest form of 4:6 is 2:3. All equivalent ratios will reduce to 2:3. 8:12 = 2:3, 12:18 = 2:3, 16:24 = 2:3. But 6:8 = 3:4, which is different.
If 4 pencils cost ₹12, how much will 7 pencils cost?
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₹21
Set up proportion: 4:12 :: 7:x. Cross multiply: 4x = 12 × 7 = 84. So x = 84 ÷ 4 = ₹21.
The ratio of boys to girls in a class is 3:2. If there are 15 boys, how many girls are there?
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10
If boys:girls = 3:2 and there are 15 boys, then 3:2 :: 15:x. Cross multiply: 3x = 2 × 15 = 30. So x = 30 ÷ 3 = 10 girls.
Which of these are correct ways to write that ratios 6:9 and 8:12 are proportional? (Select all correct)
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6:9 :: 8:12, 6/9 = 8/12
Proportional ratios can be written using :: symbol, cross multiplication (ad = bc), or as equal fractions. Addition of terms doesn't show proportionality.
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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
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