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You subtract the amount of money Lizzy has spent ($2.50) from the amount of money she started with ($20.00).
Another Hint

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56 - 15 = answer
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Gretal spent $25.75. She started with $100.00.
So, your equation to solve this problem should look like this:
$100.00 - $25.75 = answer
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First, you must add the total number of pages Soo-Ling has already read.

Another hint

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$22.50 (book) + $3.25 (ice-cream) = $25.75
Another Hint

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23 + 33 = 56. Soo-Ling has already read 56 pages.
Another Hint

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Now you can subtract the number of pages Soo-Ling has read from the total number of pages in the book.

Another Hint

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256 - 56 = answer

Answer

cost of radio - money saved = answer, so your equation should look like this:
$29.95 - $14.50 = money still needed
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Christmas is on the 25th of December. There are 31 days in November.
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There are a few ways to do this, but here's one.
Add up the total number of days in November (31) and the number of days in December until Christmas (25).

This means an equation like this: 31 + 25 = 56

Now you subtract the starting date (15th) from this total.
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First, you need to decide how much money Scobby already has.
Another Hint

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$20.00 - $2.50 = answer
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Scobby has $14.50. This is the amount you must subtract from what he needs to buy the radio.
Another hint

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