Question bank: Counting Natural Numbers Less Than 1,000

Joãozinho has a collection of football stickers. He said he has 987 stickers. His sister Maria also has a collection, but she has 13 stickers less than Joãozinho. How many stickers does Maria have in her collection?

In school, the 2nd grade class made a big box with 100 colored pens to decorate the classroom. However, during the secret friend game, each student took more than one pen from the box without anyone seeing. At the end of the game, the teacher noticed that there were only 13 pens left in the box. Now, she wants to find out how many pens each student took. To do this, she thought of a number that, when multiplied by 13, gives a result less than 1,000, because the box cannot have more than 1,000 pens. What is the maximum number of pens each student could have taken?

In the classroom, teacher Ana placed a basket with 300 colored balls. She wants you and your classmates to count the balls to help organize the school party game. You have already counted 150 balls and now the teacher wants to know how many balls are still missing for you to finish counting all 300 balls. Write a short text explaining how you would find out how many balls are still missing and what is the result.

In a little basket, Maria has apples to prepare the lunchbox for the week. On Monday, she puts 15 apples in the lunchbox; on Tuesday, she puts another 20 apples. On Wednesday, Maria puts 12 apples in the lunchbox, and on Thursday, she puts twice as many as she did on Monday. Maria wants to know how many apples she used throughout the week. Based on what you have learned about counting natural numbers less than 1,000, how many apples did Maria use in the lunchbox during the week? Write down how you counted the apples.

In a school, the principal decided to organize a competition where students must count how many books they have on their personal bookshelves. Joãozinho, who is in the 2nd year of elementary school, wants to participate by counting the books he has. He starts counting and realizes that, so far, he has counted 560 books. To find out how many more books he can count and participate in the competition, what should be the maximum number that João can count on his bookshelf, considering that the competition accepts counting books less than 1,000?