A. As with any purchase, the total cost is the cost of each item multiplied by the number of items.
$3×(32 +56)
= $3×88
= $264
B. From part A, 88 pins.
C. $3×56 = $168
D. 56 -32 = 24
Cheryl bought 24 more pins in April than in March.
(Sometimes, "the difference of M and A" is intended to be strictly interpreted as "M - A". If that is the intent here, then the answer would be -24. More commonly, this wording is interpreted in common English to mean the value that results when the smaller number is subtracted from the larger one.)