Addition & Subtraction with Regrouping Posters - Top Teacher - Free Printable

The image you've uploaded is an educational poster designed to help students understand addition and subtraction with regrouping using catchy rhymes and visual examples. Let's break down each section and explain the concepts clearly.

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🔹 Top Section: ADDITION with Regrouping

Rhyme:
- "9 or less? Let it rest."
- "10 or more? Send it next door."

#### 📌 Explanation:
This rhyme helps students remember what to do when adding digits in a column (usually ones, tens, etc.).

- If the sum of the digits in a column is 9 or less, just write that number down.
- If the sum is 10 or more, you regroup: write the ones digit in the answer and carry over the tens digit to the next column (the "next door").

> ✔ Example:
> Adding 7 + 6 = 13 → Write down 3, carry over 1 to the next column.

---

🔹 Bottom Section: SUBTRACTION with Regrouping

Rhyme:
1. "More on top? No need to stop."
2. "More on the floor? Go next door and take 10 more."
3. "No more next door? Head over one more."

These are memory aids for borrowing (regrouping) in subtraction.

Let’s go through each example:

---

#### ✔ Example 1:
```
85
- 23
----
62
```

- Ones place: 5 – 3 = 2 → no regrouping needed.
- Tens place: 8 – 2 = 6.
- Since both digits on top are larger than those below, no borrowing is needed.

✔ "More on top? No need to stop." → This applies here.

---

#### ✔ Example 2:
```
72
- 46
----
26
```

- Ones place: 2 – 6 → can't subtract because 2 < 6.
- So we borrow from the tens place.
- The 7 becomes 6, and the 2 becomes 12.
- Now: 12 – 6 = 6.
- Tens place: 6 – 4 = 2.

✔ "More on the floor? Go next door and take 10 more."
→ We borrowed 10 (from the tens), so the 2 became 12.

---

#### ✔ Example 3:
```
3913
- 137
------
266
```

Wait — let’s double-check this one.

Actually, the problem is:
```
3913
- 137
-----
```

But the result shown is 266, which is incorrect.

Let’s calculate correctly:

```
3913
- 137
-------
```

We need to align by place value:

```
3913
- 137
-------
```

Align properly:

```
3913
- 0137
-------
```

Now subtract:

- Ones: 3 – 7 → can’t do → borrow.
- Borrow from tens: but tens digit is 1 → not enough → borrow from hundreds.
- Hundreds digit is 9 → becomes 8, tens become 11 → then borrow 1 from tens → tens become 10 → now borrow 1 from tens → tens become 9, ones become 13.
- So: 13 – 7 = 6
- Tens: 9 – 3 = 6
- Hundreds: 8 – 1 = 7
- Thousands: 3 – 0 = 3

So correct answer is 3776, not 266.

✘ The answer shown (266) is wrong.

But wait — looking at the layout again, it seems like the numbers might be misaligned.

Looking closely:
```
3 9
4 0 13
- 1 3 7
--------
2 6 6
```

Ah! It appears they're doing:
```
4013
- 137
-----
3876?
```

But the top number is written as `3 9` above `4 0 13`, which suggests maybe:
- They're showing 4013 - 137?

Wait — actually, the numbers are arranged like:

```
3 9
4 0 13
- 1 3 7
---------
2 6 6
```

This is confusing. But notice:
- The top number is likely 4013
- Subtracting 137
- Result should be 3876

But the result shown is 266, which is way too small.

Also, the 39 at the top left may be a mistake or part of a different step.

Wait — perhaps the 39 is meant to be the hundreds and thousands digits, and the subtraction is:

```
4013
- 137
-----
3876
```

But the poster shows:
```
3 9
4 0 13
- 1 3 7
--------
2 6 6
```

This seems like a misalignment or error.

Let’s interpret it differently.

Possibly, it's meant to be:

```
3913
- 137
-----
3776
```

But even that doesn't give 266.

Alternatively, maybe it's:

```
391
- 137
-----
254
```

Still not 266.

Wait — look at the final answer: 266

And the subtraction:

```
4013
- 137
-----
3876
```

But the answer shown is 266 — that’s impossible.

Unless...

Wait — the numbers are not aligned properly.

Let me re-read the diagram.

It shows:

```
3 9
4 0 13
- 1 3 7
-------
2 6 6
```

This looks like three columns, so probably:

- Thousands: 3 (from 39)
- Hundreds: 9 (from 39)
- Tens: 0
- Ones: 13

Wait — that would make the number 39013, which is huge.

Then subtracting 137 → 39013 - 137 = 38876

Not 266.

So there’s a clear error in the presentation.

But let’s consider: Maybe the top number is 4013, and they’re showing regrouping steps.

Let’s assume:

```
4013
- 137
------
```

Step-by-step:

1. Ones: 3 – 7 → can’t do → borrow from tens.
- Tens digit is 1 → can’t lend → borrow from hundreds.
- Hundreds digit is 0 → can’t lend → borrow from thousands.
- Thousands: 4 → becomes 3
- Hundreds: 0 → becomes 10 → but needs to lend → becomes 9
- Tens: 1 → becomes 11 → lends 1 → becomes 10 → gives 1 to ones → ones become 13

So:
- Ones: 13 – 7 = 6
- Tens: 10 – 3 = 7
- Hundreds: 9 – 1 = 8
- Thousands: 3 – 0 = 3

Answer: 3876

But the poster says 266 — which is wrong.

So either:
- There’s a typo in the problem
- Or the example is misaligned

But looking at the visuals:
- The top number has 39 above 4013
- Then minus 137
- Answer: 266

This suggests that 39 is possibly a mistake.

Alternatively, maybe the problem is:

```
4013
- 137
-----
3876
```

But the answer shown is 266, which is incorrect.

So the third subtraction example contains an error.

---

✔ Corrected Summary

#### 🟩 Addition with Regrouping:
- If sum of digits in a column ≤ 9 → write it down.
- If ≥ 10 → write ones digit, carry tens digit to next column.

#### 🟩 Subtraction with Regrouping:
- "More on top?" → No need to borrow.
- "More on the floor?" → Need to borrow → go to next column and take 10.
- "No more next door?" → Keep going left until you find a digit you can borrow from.

---

✔ Examples (Corrected)

1. 85 - 23 = 62 → ✔️ Correct
2. 72 - 46 = 26 → ✔️ Correct (after borrowing)
3. 4013 - 137 = 3876 → ✘ Poster says 266 → Incorrect

---

🛠️ Final Notes:

- The rhymes are excellent teaching tools.
- The first two subtraction examples are correct.
- The third example has a mistake: the answer should be 3876, not 266.
- Likely, the top number was meant to be 3913, and the answer 3776, but due to formatting, it's confusing.

---

✔ Conclusion:

This poster is a great visual aid for teaching regrouping in addition and subtraction, using memorable rhymes. However, one of the subtraction examples contains an error in the final answer. The correct answer for 4013 - 137 is 3876, not 266.

Let me know if you'd like a corrected version of the poster!