Numbers — Important Questions

7530

Step 1: To form the greatest number, arrange digits in descending order: 7 > 5 > 3 > 0. Step 2: Place the largest digit first: 7 in thousands place. Step 3: Next largest: 5 in hundreds place. Step 4: Then 3 in tens place, and 0 in ones place. Step 5: Greatest number = 7530. Common mistake: Students sometimes write 7503 or 7305 by not properly ordering all four digits.

4000

Step 1: Write 34829 in the place value table: TTh=3, Th=4, H=8, T=2, O=9. Step 2: The digit 4 is in the thousands place. Step 3: Place value = 4 × 1000 = 4000. Step 4: So the place value of 4 in 34829 is 4000. Common mistake: Students may confuse thousands place with ten-thousands place and write 40000.

999, 4231, 4321, 5001

Step 1: Ascending order means smallest to greatest. Step 2: First, a 3-digit number is always less than a 4-digit number. So 999 comes first. Step 3: Now compare 4231 and 4321: thousands digit is same (4=4), hundreds digit 2 < 3, so 4231 < 4321. Step 4: 5001 is the largest. Step 5: Ascending order: 999, 4231, 4321, 5001.

9678

Step 1: Identify each part: 9000 → thousands place = 9, 600 → hundreds place = 6, 70 → tens place = 7, 8 → ones place = 8. Step 2: Fill in the place value table: Th=9, H=6, T=7, O=8. Step 3: Write all digits together: 9678. Step 4: Verify: 9000+600+70+8 = 9678. ✓ Common mistake: Students mix up the position of 6 and 7, writing 9768 instead.