Final answer:
The total number of football cards is 397 after calculating complete sets and additional cards. Given that each page holds 9 cards, the child will need 45 pages to store all the cards, accounting for one leftover card.
Step-by-step explanation:
To calculate the total number of pages needed to store the football cards, we first find the total number of cards the child has. Since there are 28 complete sets of 12 cards each, we multiply 28 sets by 12 cards per set:
28 sets × 12 cards/set = 336 cards
Next, we add the additional 61 cards to the total:
336 cards + 61 cards = 397 cards
Now, as each page holds 9 cards, we determine how many full pages are needed:
397 cards ÷ 9 cards/page = 44 pages with 1 leftover card
Since there is one leftover card, one additional page will be needed to accommodate it.
Therefore, the total number of pages required is:
44 full pages + 1 additional page = 45 pages