Educational worksheet for learning "10 More and 10 Less" using base-10 blocks and number problems.

Problem Description:

The task involves understanding and solving problems related to adding or subtracting 10 from a given number. The worksheet uses visual aids (such as blocks representing hundreds, tens, and ones) to help students grasp the concept of place value and how numbers change when 10 is added or subtracted.

Key Concepts:

1. Place Value: Numbers are broken down into hundreds, tens, and ones.
2. Adding/Subtracting 10: When you add 10 to a number, you increase the tens place by 1 (or carry over if necessary). When you subtract 10, you decrease the tens place by 1 (or borrow if necessary).

Solution Explanation:

#### Part 1: Basic Addition and Subtraction of 10
The first section shows examples of adding or subtracting 10 from numbers like 56, 16, and 58. Here's how it works:

- 56 - 10 = 46: Subtracting 10 means removing one ten block. So, 5 tens become 4 tens, and the ones remain the same.
- 16 + 10 = 26: Adding 10 means adding one ten block. So, 1 ten becomes 2 tens, and the ones remain the same.
- 58 + 10 = 68: Adding 10 means adding one ten block. So, 5 tens become 6 tens, and the ones remain the same.

#### Part 2: Crossing Hundreds Boundaries
The second section deals with cases where adding or subtracting 10 causes the number to cross a hundred boundary. Here's how it works:

1. 94 - 10 = 84:
- Start with 94, which is 9 tens and 4 ones.
- Subtracting 10 means removing one ten block. So, 9 tens become 8 tens, and the ones remain the same.
- Result: 84.

2. 94 + 10 = 104:
- Start with 94, which is 9 tens and 4 ones.
- Adding 10 means adding one ten block. So, 9 tens become 10 tens.
- Since 10 tens make a hundred, the result is 104 (1 hundred, 0 tens, and 4 ones).

3. 112 - 10 = 102:
- Start with 112, which is 1 hundred, 1 ten, and 2 ones.
- Subtracting 10 means removing one ten block. So, 1 ten becomes 0 tens.
- Result: 102 (1 hundred, 0 tens, and 2 ones).

#### Part 3: Practice Problems
The worksheet provides practice problems for students to solve. Here are the solutions:

1. 97 - 10 = 87:
- Start with 97 (9 tens and 7 ones).
- Subtract 10: 9 tens become 8 tens.
- Result: 87.

2. 83 + 10 = 93:
- Start with 83 (8 tens and 3 ones).
- Add 10: 8 tens become 9 tens.
- Result: 93.

3. 109 - 10 = 99:
- Start with 109 (1 hundred, 0 tens, and 9 ones).
- Subtract 10: 1 hundred becomes 0 hundreds, and 0 tens become 9 tens.
- Result: 99.

4. 115 + 10 = 125:
- Start with 115 (1 hundred, 1 ten, and 5 ones).
- Add 10: 1 ten becomes 2 tens.
- Result: 125.

5. 99 - 10 = 89:
- Start with 99 (9 tens and 9 ones).
- Subtract 10: 9 tens become 8 tens.
- Result: 89.

6. 101 + 10 = 111:
- Start with 101 (1 hundred, 0 tens, and 1 one).
- Add 10: 0 tens become 1 ten.
- Result: 111.

7. 120 - 10 = 110:
- Start with 120 (1 hundred, 2 tens, and 0 ones).
- Subtract 10: 2 tens become 1 ten.
- Result: 110.

8. 130 + 10 = 140:
- Start with 130 (1 hundred, 3 tens, and 0 ones).
- Add 10: 3 tens become 4 tens.
- Result: 140.

Final Answer:

The solutions to the practice problems are:
1. 97 - 10 = 87
2. 83 + 10 = 93
3. 109 - 10 = 99
4. 115 + 10 = 125
5. 99 - 10 = 89
6. 101 + 10 = 111
7. 120 - 10 = 110
8. 130 + 10 = 140

\boxed{87, 93, 99, 125, 89, 111, 110, 140}