Answer

This is best solved by using multiplication.
Another Hint

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$135 - $120 = answer
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This problem is best set out like this: 36 4 = answer
Answer

Use multiplication.
Another hint

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$171 $9 = answer
Answer

21 x 10 = answer
Answer

This problem can be set out like this: 9 + 24 = answer
Answer

Use subtraction.
Another hint

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To find out one quarter (1/4) of a number, you divide that number by 4.
For this problem, one (1) batch of biscuits = 12 biscuits.
Another Hint

Answer

24 x $12 = answer
Answer

One quarter (1/4) of 12 = 3, so after Vianna ate a quarter of the first batch, there were 9 biscuits left.
Another hint

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Vianna baked another 2 batches of biscuits. This is a total of another 24 biscuits which must be added to the number of biscuits left over from the first batch (9 biscuits).
Another hint

Answer