How to do two questions about estimation in the second grade of primary school? 1、390+230≈ 2、620-489≈ - Training Enrollment Network

How to do two questions about estimation in the second grade of primary school? 1、390+230≈ 2、620-489≈

1、390+230≈600 2、620-489≈ 150/ 100

Because 390+230 = 590, the approximate value of 590 is 600.

Because 620-489 = 13 1, the approximate value is 150, and if calculated in whole hundred, it is 100.

Related articles

A school math interest group is a test.

When will the results of Mr. Shao Dong's exam come out?

800-word summary composition for the first year of vocational high school.

How to send a circle of friends when winning the math festival?

How to do math and variant exercises in junior two?

Is there a young connecting class in Urumqi 59 primary school?

Want to review advanced mathematics for postgraduate entrance examination, what good books do you recommend?

What is the total score of Shanghai senior high school entrance examination?

The head of mathematician Archimedes

How to restore the fourth-order Rubik's cube