Let’s go through each problem one by one and solve them carefully.
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Problem 1: Write the largest number you can using the numbers: 6, 4, 9, 3
To make the largest number, we put the biggest digit in the thousands place, then the next biggest in hundreds, and so on.
Digits: 9, 6, 4, 3 → Largest to smallest
So:
9643
✔ Check: 9 > 6 > 4 > 3 → correct order for largest number.
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Problem 2: Write the smallest number you can using the numbers: 4, 8, 0, 3
Important: We cannot start with 0 (because that would not be a 4-digit number).
Smallest non-zero digit first: 3
Then arrange the rest from smallest to largest: 0, 4, 8
So:
3048
✔ Check: Can’t start with 0 → 3 is smallest valid start → then 0, 4, 8 → yes.
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Problem 3: Order these numbers from smallest to largest: 5768, 5129, 809, 4300
First, look at how many digits each has:
- 809 → 3 digits → smallest
- Others are 4-digit numbers → compare them
Compare 4-digit numbers:
Look at thousands place:
- 5768 → 5
- 5129 → 5
- 4300 → 4 → smaller than both 5s
So order so far: 809, 4300, then 5129 and 5768
Now compare 5129 and 5768 → same thousands digit (5), look at hundreds:
- 5129 → 1
- 5768 → 7 → bigger
So 5129 < 5768
Final order:
809, 4300, 5129, 5768
✔ Double-check:
809 (smallest)
then 4300
then 5129
then 5768 (largest) — correct.
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Problem 4: Write the number before and after:
a) ___ 648 ___
Before = 648 - 1 =
647
After = 648 + 1 =
649
b) ___ 200 ___
Before = 200 - 1 =
199
After = 200 + 1 =
201
✔ Simple counting — no tricks here.
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Problem 6: Write the number before and after:
a) ___ 1250 ___
Before = 1250 - 1 =
1249
After = 1250 + 1 =
1251
b) ___ 3008 ___
Before = 3008 - 1 =
3007
After = 3008 + 1 =
3009
✔ Again, just subtract/add 1.
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Problem 7: Subtract and add 10 to 590
Subtract 10: 590 - 10 =
580
Add 10: 590 + 10 =
600
✔ Easy mental math.
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Problem 8: Subtract and add 10 to 9655
Subtract 10: 9655 - 10 =
9645
Add 10: 9655 + 10 =
9665
✔ Just change the tens digit down or up by 1.
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All problems solved and checked.
Final Answer:
1. 9643
2. 3048
3. 809, 4300, 5129, 5768
4a. 647, 649
4b. 199, 201
6a. 1249, 1251
6b. 3007, 3009
7. 580, 600
8. 9645, 9665
Parent Tip: Review the logic above to help your child master the concept of place value 3rd grade math worksheet.