Let’s go through each problem one by one.
We’re using base ten blocks:
- A big cube = 1000 (thousands)
- A flat square = 100 (hundreds)
- A rod = 10 (tens)
- A small cube = 1 (ones)
We count how many of each we have, then write the number.
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Problem 1:
- Thousands: 3 big cubes → 3 × 1000 = 3000
- Hundreds: 9 flat squares → 9 × 100 = 900
- Tens: 7 rods → 7 × 10 = 70
- Ones: 0 small cubes → 0
Add them: 3000 + 900 + 70 + 0 =
3970
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Problem 2:
- Thousands: 5 big cubes → 5 × 1000 = 5000
- Hundreds: 3 flat squares → 3 × 100 = 300
- Tens: 7 rods → 7 × 10 = 70
- Ones: 7 small cubes → 7 × 1 = 7
Add them: 5000 + 300 + 70 + 7 =
5377
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Problem 3:
- Thousands: 2 big cubes → 2 × 1000 = 2000
- Hundreds: 4 flat squares → 4 × 100 = 400
- Tens: 8 rods → 8 × 10 = 80
- Ones: 2 small cubes → 2 × 1 = 2
Add them: 2000 + 400 + 80 + 2 =
2482
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Problem 4:
- Thousands: 4 big cubes → 4 × 1000 = 4000
- Hundreds: 5 flat squares → 5 × 100 = 500
- Tens: 6 rods → 6 × 10 = 60
- Ones: 3 small cubes → 3 × 1 = 3
Add them: 4000 + 500 + 60 + 3 =
4563
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Problem 5:
- Thousands: 1 big cube → 1 × 1000 = 1000
- Hundreds: 9 flat squares → 9 × 100 = 900
- Tens: 10 rods → 10 × 10 = 100 → Wait! That’s actually 10 tens = 100, so that adds to hundreds!
But let’s be careful — in base ten, 10 rods = 1 hundred. So if there are 10 rods, we should carry over.
Actually, looking again:
Tens: 10 rods → 10 × 10 = 100 → that’s 1 more hundred.
So total hundreds = 9 (from flats) + 1 (from rods) = 10 hundreds → which is 1000 → carry over to thousands!
Wait — let’s recount carefully.
Original:
- Thousands: 1 → 1000
- Hundreds: 9 flats → 900
- Tens: 10 rods → 100 → this makes total hundreds = 900 + 100 = 1000 → so now thousands become 1 + 1 = 2, and hundreds become 0
- Ones: 9 small cubes → 9
So:
Thousands: 1 + 1 (carry) = 2 → 2000
Hundreds: 0
Tens: 0 (because 10 rods became 1 hundred)
Ones: 9
Total: 2000 + 0 + 0 + 9 =
2009
Wait — let me double-check the image description.
In problem 5:
“1 big cube” → 1000
“9 flat squares” → 900
“10 rods” → 100
“9 small cubes” → 9
So total = 1000 + 900 + 100 + 9 = 2009
Yes, correct.
Alternatively, think of it as:
1000 + 900 = 1900
1900 + 100 = 2000
2000 + 9 = 2009
Perfect.
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Final Answers:
1) 3970
2) 5377
3) 2482
4) 4563
5) 2009
Final Answer:
3970, 5377, 2482, 4563, 2009
Parent Tip: Review the logic above to help your child master the concept of base 10 math worksheet.
