Summary of an open lesson in mathematics, grade 2 (“Russian School”) on the topic “Inverse problems”

1. home
2. Directories
3. Handbook of mathematics for elementary school
4. Tasks
5. Inverse problems

In the inverse problem, one of the sought quantities becomes known, and one of the given quantities becomes unknown.

Direct task:

Tanya had 3 green balls and 2 red ones. How many balls did Tanya have in total?

First inverse problem:

Tanya had 5 balls, 3 balls were green and the rest were red. How many red balls did Tanya have?

You see that the known quantity - the red balls - has become unknown.

And the unknown quantity - the total number of balls - became known.

Second inverse problem:

Tanya had 5 balls, 2 balls were red and the rest were green. How many green balls did Tanya have?

You see that a known quantity - green balls - has become unknown.

And the unknown quantity - the total number of balls - became known.

SUCH PROBLEMS ARE CALLED INVERSE.

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