Mental Math Addition & Subtraction Worksheet! - Free Printable

The task involves performing simple arithmetic operations (adding 10, subtracting 10, adding 100, and subtracting 100) on a series of numbers. Let's solve it step by step for each number.

Given Numbers:

1. 125
2. 368
3. 617
4. 282
5. 834
6. 473
7. 555

Instructions:

- Add 10 more: Add 10 to the given number.
- Subtract 10 less: Subtract 10 from the given number.
- Add 100 more: Add 100 to the given number.
- Subtract 100 less: Subtract 100 from the given number.

Solution:

#### Number: 125
- Add 10 more: \( 125 + 10 = 135 \)
- Subtract 10 less: \( 125 - 10 = 115 \)
- Add 100 more: \( 125 + 100 = 225 \)
- Subtract 100 less: \( 125 - 100 = 25 \)

#### Number: 368
- Add 10 more: \( 368 + 10 = 378 \)
- Subtract 10 less: \( 368 - 10 = 358 \)
- Add 100 more: \( 368 + 100 = 468 \)
- Subtract 100 less: \( 368 - 100 = 268 \)

#### Number: 617
- Add 10 more: \( 617 + 10 = 627 \)
- Subtract 10 less: \( 617 - 10 = 607 \)
- Add 100 more: \( 617 + 100 = 717 \)
- Subtract 100 less: \( 617 - 100 = 517 \)

#### Number: 282
- Add 10 more: \( 282 + 10 = 292 \)
- Subtract 10 less: \( 282 - 10 = 272 \)
- Add 100 more: \( 282 + 100 = 382 \)
- Subtract 100 less: \( 282 - 100 = 182 \)

#### Number: 834
- Add 10 more: \( 834 + 10 = 844 \)
- Subtract 10 less: \( 834 - 10 = 824 \)
- Add 100 more: \( 834 + 100 = 934 \)
- Subtract 100 less: \( 834 - 100 = 734 \)

#### Number: 473
- Add 10 more: \( 473 + 10 = 483 \)
- Subtract 10 less: \( 473 - 10 = 463 \)
- Add 100 more: \( 473 + 100 = 573 \)
- Subtract 100 less: \( 473 - 100 = 373 \)

#### Number: 555
- Add 10 more: \( 555 + 10 = 565 \)
- Subtract 10 less: \( 555 - 10 = 545 \)
- Add 100 more: \( 555 + 100 = 655 \)
- Subtract 100 less: \( 555 - 100 = 455 \)

Final Answer:

\[
\begin{array}{|c|c|c|c|c|}
\hline
\text{Number} & \text{Add 10 more} & \text{Subtract 10 less} & \text{Add 100 more} & \text{Subtract 100 less} \\
\hline
125 & 135 & 115 & 225 & 25 \\
\hline
368 & 378 & 358 & 468 & 268 \\
\hline
617 & 627 & 607 & 717 & 517 \\
\hline
282 & 292 & 272 & 382 & 182 \\
\hline
834 & 844 & 824 & 934 & 734 \\
\hline
473 & 483 & 463 & 573 & 373 \\
\hline
555 & 565 & 545 & 655 & 455 \\
\hline
\end{array}
\]

\boxed{
\begin{array}{|c|c|c|c|c|}
\hline
\text{Number} & \text{Add 10 more} & \text{Subtract 10 less} & \text{Add 100 more} & \text{Subtract 100 less} \\
\hline
125 & 135 & 115 & 225 & 25 \\
\hline
368 & 378 & 358 & 468 & 268 \\
\hline
617 & 627 & 607 & 717 & 517 \\
\hline
282 & 292 & 272 & 382 & 182 \\
\hline
834 & 844 & 824 & 934 & 734 \\
\hline
473 & 483 & 463 & 573 & 373 \\
\hline
555 & 565 & 545 & 655 & 455 \\
\hline
\end{array}
}