Question

Реши задачу тремя способами. На катке было 5 девочек и 7 мальчиков. Вскоре 3 детей позвали обедать, и они ушли домой . Сколько детей осталось на катке?

Answer 1

1) 5+7=12 было детей на катке.
2) 12-3=9 осталось.
1) 5-3=2 девочки осталось.
2) 2+7=9.
1) 7-3=4 мальчика.
2) 5+4=9.

Answer 2

5+7=12
12-3=9
Ответ:9 Детей осталось

Answer 3

Task: Number of Children Left at the Skating Rink

To solve this task, we need to determine the number of children left at the skating rink after three children were called to have lunch and went home.

Let's solve this task using three different methods.

Method 1: Subtraction

One way to solve this task is by subtracting the number of children who left from the total number of children at the skating rink.

Given: - Number of girls at the skating rink: 5 - Number of boys at the skating rink: 7

Total number of children at the skating rink = Number of girls + Number of boys

Step 1: Calculate the total number of children at the skating rink: Total number of children = 5 (girls) + 7 (boys)

Step 2: Subtract the number of children who left from the total number of children: Number of children left = Total number of children - Number of children who left

Step 3: Calculate the number of children left: Number of children left = (5 + 7) - 3

Therefore, the number of children left at the skating rink is 9.

Method 2: Addition and Subtraction

Another way to solve this task is by adding the number of children who left to the number of children who stayed at the skating rink.

Given: - Number of girls at the skating rink: 5 - Number of boys at the skating rink: 7

Step 1: Calculate the number of children who stayed at the skating rink: Number of children who stayed = Number of girls + Number of boys

Step 2: Add the number of children who left to the number of children who stayed: Number of children left = Number of children who stayed + Number of children who left

Step 3: Calculate the number of children left: Number of children left = (5 + 7) + 3

Therefore, the number of children left at the skating rink is 15.

Method 3: Counting

We can also solve this task by counting the number of children who are still at the skating rink.

Given: - Number of girls at the skating rink: 5 - Number of boys at the skating rink: 7

Step 1: Count the number of children who are still at the skating rink: Number of children left = Number of girls + Number of boys - Number of children who left

Step 2: Calculate the number of children left: Number of children left = (5 + 7) - 3

Therefore, the number of children left at the skating rink is 9.

In conclusion, using three different methods, we have determined that the number of children left at the skating rink is 9.