Base Ten Blocks Addition Worksheet - Math Worksheet 27 with Answer Key

The image provided is a math worksheet focusing on addition using base ten blocks. The task involves writing the correct equation for each problem based on the visual representation of base ten blocks. Below, I will explain the solution for each problem step by step.

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Problem 1:

- Visual Representation:
- 2 large cubes (each representing 1000)
- 6 flat squares (each representing 100)
- 24 rods (each representing 10)
- 25 small dots (each representing 1)

- Step-by-Step Solution:
1. Count the large cubes: \( 2 \times 1000 = 2000 \)
2. Count the flat squares: \( 6 \times 100 = 600 \)
3. Count the rods: \( 24 \times 10 = 240 \)
4. Count the small dots: \( 25 \times 1 = 25 \)

- Add all these values together:
\[
2000 + 600 + 240 + 25 = 2865
\]

- Final Answer:
\[
2000 + 600 + 240 + 25 = 2865
\]

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Problem 2:

- Visual Representation:
- 3 large cubes (each representing 1000)
- 15 flat squares (each representing 100)
- 18 rods (each representing 10)
- 36 small dots (each representing 1)

- Step-by-Step Solution:
1. Count the large cubes: \( 3 \times 1000 = 3000 \)
2. Count the flat squares: \( 15 \times 100 = 1500 \)
3. Count the rods: \( 18 \times 10 = 180 \)
4. Count the small dots: \( 36 \times 1 = 36 \)

- Add all these values together:
\[
3000 + 1500 + 180 + 36 = 4716
\]

- Final Answer:
\[
3000 + 1500 + 180 + 36 = 4716
\]

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Problem 3:

- Visual Representation:
- 6 large cubes (each representing 1000)
- 9 flat squares (each representing 100)
- 30 rods (each representing 10)
- 40 small dots (each representing 1)

- Step-by-Step Solution:
1. Count the large cubes: \( 6 \times 1000 = 6000 \)
2. Count the flat squares: \( 9 \times 100 = 900 \)
3. Count the rods: \( 30 \times 10 = 300 \)
4. Count the small dots: \( 40 \times 1 = 40 \)

- Add all these values together:
\[
6000 + 900 + 300 + 40 = 7240
\]

- Final Answer:
\[
6000 + 900 + 300 + 40 = 7240
\]

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Summary of Answers:

1. \( 2000 + 600 + 240 + 25 = 2865 \)
2. \( 3000 + 1500 + 180 + 36 = 4716 \)
3. \( 6000 + 900 + 300 + 40 = 7240 \)

Thus, the final boxed answers are:
\[
\boxed{2865, 4716, 7240}
\]