6) Which whole number lies one-quarter of the way between the following numbers? \( \begin{array}{ll}\text { a) } 987320250 \text { and } 987320450 & \text { b) } 250700 \text { and } 251100 \\ \text { c) } 251100 \text { and } 251500 & \text { d) } 250900 \text { and } 251300\end{array} \)

To find the whole number that lies one-quarter of the way between two numbers, you can use the following formula: \[ \text{One-quarter point} = \text{First number} + \frac{1}{4} \times (\text{Second number} - \text{First number}) \] Let's apply this to each part: ### a) Between 987,320,250 and 987,320,450 1. **Calculate the difference:** \[ 987,320,450 - 987,320,250 = 200 \] 2. **Find one-quarter of the difference:** \[ \frac{1}{4} \times 200 = 50 \] 3. **Add this to the first number:** \[ 987,320,250 + 50 = 987,320,300 \] **Answer:** **987,320,300** --- ### b) Between 250,700 and 251,100 1. **Calculate the difference:** \[ 251,100 - 250,700 = 400 \] 2. **Find one-quarter of the difference:** \[ \frac{1}{4} \times 400 = 100 \] 3. **Add this to the first number:** \[ 250,700 + 100 = 250,800 \] **Answer:** **250,800** --- ### c) Between 251,100 and 251,500 1. **Calculate the difference:** \[ 251,500 - 251,100 = 400 \] 2. **Find one-quarter of the difference:** \[ \frac{1}{4} \times 400 = 100 \] 3. **Add this to the first number:** \[ 251,100 + 100 = 251,200 \] **Answer:** **251,200** --- ### d) Between 250,900 and 251,300 1. **Calculate the difference:** \[ 251,300 - 250,900 = 400 \] 2. **Find one-quarter of the difference:** \[ \frac{1}{4} \times 400 = 100 \] 3. **Add this to the first number:** \[ 250,900 + 100 = 251,000 \] **Answer:** **251,000** --- **Summary of Answers:** - **a)** 987,320,300 - **b)** 250,800 - **c)** 251,200 - **d)** 251,000