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Find out the math problems of grade four and grade five in primary school (directly write numbers, verticals, disjoint, equations)
2. First, the calculation ability test.

1, write directly.

42×20= 240÷5= 700×40= 707÷7= 60× 12=

9600÷8= 30×62= 340÷4= 14×7= 8 10÷90=

2. Column vertical calculation.

178×46= 408×25= 37×235= 380×23=

3. Calculate with recursive equation.

360÷6×5 1 380+350÷70 ( 165-75÷3)×8

4 1, the number is written directly:

①30× 12= ②23×4= ③540-3 10= ④4× 140= ⑤630+70=

⑥ 130×20= ⑦ 180×5= ⑧ 170×5= ⑨500×5= ⑩2 10÷7=

2, with vertical calculation:

⑴ 236×43= ⑵ 208×56=

⑶ 720×42= ⑷ 480×50=

1, a number written directly.

85÷ 17= 950÷ 19= 144÷ 12= 63÷2 1= 780÷ 13= 630÷2 1=

75÷ 15= 240÷ 15= 380÷ 19= 520÷26= 420÷2 1= 80÷ 16=

200÷25= 500÷25= 400÷25= 1000÷25= 225÷25= 750÷25=

140÷20= 360÷ 18= 630÷70= 95÷ 19= 270÷90= 360÷ 12=

2. Column vertical calculation.

5 16÷43= 279÷93= 888÷74=

3, column recursive equation calculation.

1000-(480÷96+36) 253+(565-205)÷30 375÷(25- 10)× 15

1, the number is written directly:

①39÷3= ②80÷20= ③640÷80= ④800÷400= ⑤240÷60=

⑥20×5= ⑦270÷90= ⑧570÷3= ⑨3500÷700= ⑩900÷ 100=

2. Estimate:

①80÷ 19≈ ②92÷30≈ ③400÷49≈ ④632÷90≈

⑤633÷88≈ ⑥350÷68≈ ⑦242÷60≈ ⑧240÷8 1≈

3, with vertical calculation:

①720÷ 18= ②432÷27= ③958÷43= ④708÷59=

1, happy oral arithmetic. (10)

80÷20= 140÷70= 450÷50= 240÷30= 360÷6=

25×4= 240×3= 200×30= 180×5= 60× 120=

2. Calculate the following questions vertically. (12)

( 1)285×24= (2) 208× 15= (3) 32× 130=

(4) 130×60= (5) 702÷ 13= (6) 278÷73=

3. Estimate the following questions. (4 points)

( 1)722÷90≈ (2)36 1÷59≈ (3)208×29≈ (4)49×79≈

4. Column calculation. (4 points)

(1) One factor is 298 and the other factor is 3 1. What is the approximate product?

(2) It is known that the product of two factors is 576, and one factor is 18. What is another factor?