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I see the math exercises in the image you've uploaded. I'll break down and solve the tasks for you one by one. Let's go through them.

### Task 1: Basic Operations
- **1a**: \( 1.3 + 12.4 = 13.7 \)
- **1b**: \( 7.44 - 3.4 = 4.04 \)
- **1c**: \( 3.97 - 2.68 = 1.29 \)
- **1d**: \( 4 + 5 = 9 \)
- **1e**: \( 2 - 2 = 0 \)
- **1f**: \( 5 - 3 = 2 \)
- **1g**: \( 8 \div 4 = 2 \)
- **1h**: \( 8 \div 3 = 2.67 \) (approx.)

### Task 2: Number Wall
#### a) Add adjacent numbers:
Top layer number = sum of numbers below:
- \( 1 + 2 = 3 \)
- \( 1 + 1 = 2 \)
- \( 1 + 2 = 3 \)

#### b) Subtract adjacent numbers:
Top layer number = difference between numbers below:
- \( 5.4 - (-3.4) = 8.8 \)

### Task 3: Correcting Sven’s Calculations
#### a) Subtraction mistake:
The correct result for \( 5.6 - 3.4 = 2.2 \) is written incorrectly as 4.2. 
- Correction: \( 5.6 - 3.4 = 2.2 \)

#### b) Addition mistake:
The correct result for \( 10.6 - 4.795 \) should be recalculated. Sven wrote 1.477 incorrectly.
- Correct calculation: 
\[
10.6 - 4.795 = 5.805
\]

### Task 4: Decide Between Plus or Minus
- **a)** \( 2.3 + 4.8 - 7.3 = -0.2 \)
- **b)** \( -5.2 + 4.2 + 2.2 - 1.8 = -0.6 \)
- **c)** \( \frac{3}{4} + \left( -\frac{1}{3} \right) + \frac{5}{3} = \frac{5}{4} \)
- **d)** \( 5.2 - 7.8 - 8.2 + 2.8 = -8.0 \)

### Task 5: Jumping Contest (Janik and Paul)
#### a) Estimating distances:
From the chart:
- Janik: \( 4.52 \, \text{m}, 3.94 \, \text{m}, 4.91 \, \text{m} \)
- Paul: \( 4.1 \, \text{m}, 4.6 \, \text{m}, 4.77 \, \text{m} \)

#### b) Total distances for each:
- **Janik**: \( 4.52 + 3.94 + 4.91 = 13.37 \, \text{m} \)
- **Paul**: \( 4.1 + 4.6 + 4.77 = 13.47 \, \text{m} \)

Paul wins since he jumped a total of 13.47 meters, compared to Janik's 13.37 meters.

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Would you like more details on any specific part of these solutions? Here are 5 related questions for further exploration:

1. How can you break down more complex subtraction problems with decimals?
2. What is the strategy for estimating sums when working with fractions?
3. Can you identify patterns when solving number wall exercises?
4. What are the common mistakes made in decimal operations, and how can you avoid them?
5. How would you set up a competitive jump contest in terms of measurement and fairness?

**Tip**: Always double-check each step when dealing with decimals or fractions to avoid simple arithmetic mistakes.

A set of math exercises involving basic arithmetic operations, number walls, error correction, and word problems about distance in a jumping contest.

Solve basic arithmetic problems, including addition, subtraction, and division. Apply these concepts to number walls, error correction tasks, and a word problem about a jumping contest, suitable for Grade 5-6 students.

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