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Bài toán đố về phép nhân: bánh pizza

Thuyết minh video

Beatriz is ordering pizzas for party each pizza is cut into 12 pieces Beatriz wants to have enough pizza so that each person can have four pieces can have four pieces and 16 people will be at the party a lot of information in this problem if Beatriz buy seven pizzas so you buy seven pizzas how many extra pieces will there be after each person eats four pieces so to do this let's think about how many total pieces she will have and then let's think about how many total pieces will be eaten by the 16 people and then we'll figure out how much that she had extra so first let's think about how many total pieces and I encourage you to pause the video and try to figure it out yourself she has she ordered seven pizzas how many total pieces are there going to be well you have seven pizzas seven that's the number of pizzas number of pizzas and if you have if you have 12 pieces per pizza you multiply by 12 to get the total number of pieces so this is number of pieces pieces per pizza and seven times 12 is equal to 84 total pieces total total pieces so that's how many pieces she's got now let's think about how many get eaten by the 16 people so you have 16 people 16 that's the number of people number of people and this little symbol that's shorthand for number 16 people and they each eat four pieces so sixteen people times four pieces per person so number of pieces per person pieces per per person 16 times 4 is 64 so that's 64 not 84 64 64 pieces are eaten are eaten by the 16 so how much does she have left over well if you start with 84 pieces and 64 get eaten 84 minus 64 is 20 so you have you have we deserve a drum roll now you have 20 pieces 20 pieces that are going to be or 20 extra pieces after everyone eats their share