To put the numbers in order from least to greatest, let's first convert them all to a common format—decimals.
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2 18/40:
- First, convert the fraction \( 18/40 \) to decimal: \[ 18 ÷ 40 = 0.45 \]
- Therefore, \( 2 + 0.45 = 2.45 \).
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0.15: This number is already in decimal form.
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-0.65: This number is also already in decimal form.
Now we have the numbers converted to decimals:
- \( 2.45 \)
- \( 0.15 \)
- \( -0.65 \)
Next, we arrange them from least to greatest:
- \( -0.65 \)
- \( 0.15 \)
- \( 2.45 \)
So, in order from least to greatest, the numbers are: \[ -0.65, 0.15, 2 \frac{18}{40} \text{ (or 2.45)} \]