Math quick calculation and clever calculation exercises and answers in the third grade of primary school

The third grade of primary school

20 18-0 1-03

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utilize

First, write the calculation results directly:

① 1000-547

② 100000-85426

③ 1 1 1 1 1 1 1 1 1 10000000000- 1 1 1 1 1 1 1 1 1 1

④ 78053000000-78053

Second, sum with a simple method:

①536+(54 1+464)+459

② 588+264+ 148

③ 8996+3458+7546

④567+558+562+555+563

Third, find out the difference in a simple way:

① 1870-280-520

② 4995-(995-480)

③ 4250-294+94

④ 1272-995

Four, use a simple method to calculate the following questions:

① 478- 128+ 122-72

② 464-545+99+345

③ 537-(543- 163)-57

④ 947+(372-447)-572

Five, skilled calculation of the following questions:

① 996+599-402

② 7443+2485+567+245

③ 2000- 1347-253+ 1593

④3675-( 1 1+ 13+ 15+ 17+ 19)

answer

First, write the calculation results directly:

① 1000-547=453

② 100000-85426= 14574

③ 1 1 1 1 1 1 1 1 1 10000000000- 1 1 1 1 1 1 1 1 1 1

= 1 1 1 1 1 1 1 1 108888888889

④ 78053000000-78053=7805292 1947

This problem is mainly to practice the method of writing "complement" directly: from the highest point, it

Each digit is rounded to 9, and the last digit is rounded to 10.