I'll fill it out. (*** 12)

1.(3, 4)

2.(90)。 ( 50 ),(4500)。

3.( 2280)( 6 )( 22800 )(600)

4.( 100)(980 1)

5.( 300)( 1500)( 1800)( 18000)

5. A just judge (tick the right one in brackets and cross the wrong one). (10)

1.(× )

2.(√ )

3.( √ )

4.( × )

5.(× )

Third, little psychic.

1. Oral calculation (20 points)

60 90 60 150 0 1000 980 99 120 0

2. Using vertical calculation:

864 1296 17 10 480 1620 999 15 12 1377 2666

3。 exclusive of

3 14 3000 82 840 945 1904