To use a number line to find the total cost of 6 pencils that each cost $0.20, John can follow these steps:
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Understand the Cost per Pencil: Each pencil costs $0.20.
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Calculate the Total Cost: Multiply the number of pencils by the cost per pencil: \[ \text{Total cost} = \text{Number of pencils} \times \text{Cost per pencil} = 6 \times 0.20 = 1.20 \]
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Using a Number Line:
- Draw a horizontal line and mark it with increments of $0.20.
- Below the line, you can label the points: $0.20, $0.40, $0.60, $0.80, $1.00, $1.20.
- Start at $0 (the starting point) and make jumps to the right for each pencil, moving $0.20 each time.
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Count the Jumps:
- From $0.00, make the following jumps:
- First jump to $0.20 (1 pencil)
- Second jump to $0.40 (2 pencils)
- Third jump to $0.60 (3 pencils)
- Fourth jump to $0.80 (4 pencils)
- Fifth jump to $1.00 (5 pencils)
- Sixth jump to $1.20 (6 pencils)
- From $0.00, make the following jumps:
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Final Result: After six jumps, John lands on $1.20, which is the total cost of the 6 pencils.
By visualizing this with a number line, John can easily see how he reaches the total cost.