2. Calculate the following. Remember to estimate your answer first: a) $$ 7,123+12,567 $$ b) $$ 65,34-1,286 $$ (c) $$ 987,543-32,431 $$ 3. Calculate the following and then round off your answer to two decima places: a) $$ 32,452+9,543+0,5409 $$ (b) $$ 98,4311-88,31+54,1034 $$ (c) $$ 0,45-0,003-0,001 $$

Question

UpStudy AI · Accepted Answer

Let's solve the problems step by step.

### Problem 2: Estimation and Calculation

#### a) $$ 7,123 + 12,567 $$

**Estimation:**
- Round $$ 7,123 $$ to $$ 7,100 $$
- Round $$ 12,567 $$ to $$ 12,600 $$
- Estimated sum: $$ 7,100 + 12,600 = 19,700 $$

**Calculation:**
$$
7,123 + 12,567 = 19,690
$$

#### b) $$ 6,534 - 1,286 $$

**Estimation:**
- Round $$ 6,534 $$ to $$ 6,500 $$
- Round $$ 1,286 $$ to $$ 1,300 $$
- Estimated difference: $$ 6,500 - 1,300 = 5,200 $$

**Calculation:**
$$
6,534 - 1,286 = 5,248
$$

#### c) $$ 987,543 - 32,431 $$

**Estimation:**
- Round $$ 987,543 $$ to $$ 987,500 $$
- Round $$ 32,431 $$ to $$ 32,400 $$
- Estimated difference: $$ 987,500 - 32,400 = 955,100 $$

**Calculation:**
$$
987,543 - 32,431 = 955,112
$$

### Problem 3: Calculation and Rounding

#### a) $$ 32,452 + 9,543 + 0.5409 $$

**Calculation:**
$$
32,452 + 9,543 + 0.5409 = 42,995.5409
$$
**Rounding to two decimal places:**
$$
42,995.54
$$

#### b) $$ 98,431.1 - 88.31 + 54.1034 $$

**Calculation:**
$$
98,431.1 - 88.31 + 54.1034 = 98,396.8934
$$
**Rounding to two decimal places:**
$$
98,396.89
$$

#### c) $$ 0.45 - 0.003 - 0.001 $$

**Calculation:**
$$
0.45 - 0.003 - 0.001 = 0.446
$$
**Rounding to two decimal places:**
$$
0.45
$$

### Summary of Results
- **Problem 2:**
  - a) $$ 19,690 $$
  - b) $$ 5,248 $$
  - c) $$ 955,112 $$

- **Problem 3:**
  - a) $$ 42,995.54 $$
  - b) $$ 98,396.89 $$
  - c) $$ 0.45 $$
- **Problem 2:** - a) 19,690 - b) 5,248 - c) 955,112 - **Problem 3:** - a) 42,995.54 - b) 98,396.89 - c) 0.45

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