Subtracting with Regrouping with Base 10 Blocks. Part1 Worksheet ... - Free Printable

Let’s solve each subtraction problem step by step using base 10 blocks and regrouping when needed.

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First Problem: 482 – 164

We start with:
- 4 flats (hundreds) = 400
- 8 longs (tens) = 80
- 2 cubes (ones) = 2
Total: 482

We need to subtract:
- 1 flat (100)
- 6 longs (60)
- 4 cubes (4)

But look at the ones place: we have only 2 cubes, but we need to take away 4. So we must regroup.

→ Take 1 long (which is 10) and break it into 10 cubes.
Now we have:
- 4 flats
- 7 longs (because we used 1)
- 12 cubes (2 + 10)

Now subtract:

Ones: 12 – 4 = 8
Tens: 7 – 6 = 1
Hundreds: 4 – 1 = 3

So answer is 318

Check: 318 + 164 = 482 → Correct!

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Second Problem: 753 – 329

Start with:
- 7 flats = 700
- 5 longs = 50
- 3 cubes = 3
Total: 753

Subtract:
- 3 flats
- 2 longs
- 9 cubes

Ones place: We have 3 cubes, need to take away 9 → Not enough! Regroup.

→ Take 1 long (10) and turn it into 10 cubes.
Now we have:
- 7 flats
- 4 longs
- 13 cubes (3 + 10)

Still not enough? Wait — 13 is more than 9, so now we can do:

Ones: 13 – 9 = 4
Tens: 4 – 2 = 2
Hundreds: 7 – 3 = 4

Wait — that gives us 424. But let’s double-check because sometimes we might miss something.

Actually, let’s write it vertically:

```
753
– 329
------
```

Ones: 3 < 9 → borrow from tens. Tens digit is 5, becomes 4. Ones become 13.
13 – 9 = 4

Tens: 4 (after borrowing) – 2 = 2

Hundreds: 7 – 3 = 4

So yes, 424.

Check: 424 + 329 = 753 → Correct!

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Final Answer:
318
424