This is an exercise in Exercise 9 in the first volume of the third grade mathematics of People's Education Press: "In summer, we should enclose a water area in the lake as a fishing garden, as shown in the figure. How long is the net enough? " The answer is as follows:

The total length of the distance between three sides is the length of the rope.

Solution: The length of the net is:

194+248+ 165

=( 190+240+ 160)+(4+8+5)

=590+ 17

=607

A: It is enough to prepare a 607-meter-long net.

Math learning skills in grade three

First, make a practical plan, parents and children discuss it together, and reasonably list the time period for completing some important things and the goals to be achieved.

Second, in the process of mathematics learning, we should have a clear review consciousness and gradually develop good review habits, so as to gradually learn to learn. Mathematics review is a reflective learning process. We should reflect on whether the knowledge and skills we have learned have reached the level required by the curriculum; It is necessary to reflect on what mathematical thinking methods are involved in learning and how these mathematical thinking methods are used.

Third, math is different from doing problems. Never ignore the most basic concepts, axioms, theorems and formulas. During the winter vacation, we should sort out the concepts we have learned in textbooks, and deepen our impression through reading and copying, especially the concepts that are easily confused, so as not to leave hidden dangers.