4÷0.5= 12÷0.06= 12÷ 1.2= 3÷30=

0. 15×7= 3.2×6+3.2×4= 2.5×4×0.36=

0.2+0.8×0.5= 6.03× 1000= 10×0.6= 6.45×0.0 1=

0. 1×0. 1= 0.24×0.5= 5.4+3.6= 1.25-0.25=

10.2×4.5= 2.5×6= 9×0.25= 0. 125×4=

1.25×8×0.5= 16×0.0 1= 1.78÷0.3= 0.27÷0.003=

0.0 1÷0. 1 = 1.8×20 = x-0.4x = 5d-2d =

3.6÷0.4= 0.6×0.8= 2.4×3= 0. 12×0.7=

4÷5= 1.6÷0.5= 0.2÷0.05= 2.5×2.3×4=

1.5÷ 1.5+ 1.5= 3.6- 1.2÷2.4= 4.7×6+4×4.7=

0.5×4÷0.5×4= 38.5×0×0.38= 0.6×0.8= 3×0.9=

2.5×0.4= 3.6×0.4 12.5×8= 50×0.04= 80×0.3= 1. 1×9

Second, use vertical calculation.

8.08-2.68= 5.546+29.38= 17.04×0.26 = 8.35×3.5=

Three, vertical calculation (decimal places)

0.43×0.29≈ 52.6×0.23≈ 4.58×0.37≈

Four, longitudinal calculation (two digits after the decimal point)

4.3×8. 14≈ 27.6×0.45≈ 27.6×0.45≈

20÷ 12≈ 2.9× 1.8≈ 5.08×0.25≈

Five, vertical calculation (three digits after the decimal point)

2.5÷0.7= 2.5÷0.7= 3.25×9.04=

Six, vertical calculation (expressed by cyclic decimal quotient)

36.8÷ 16≈ 10. 1÷3.3≈ 15.3÷ 1 1≈ 0.78÷ 1≈

Seven, off-type calculation

(2.65+2.77)÷( 1.98-0.98)= 3.7×9 1.6+6.3×9 1.6=

0.45× 12×0.2= 6.2×2. 1-2. 12.8-2.8×0. 15=

2.8× 1.43+0.57= 10-6.06+8.5=

6×0.25× 1.8= 144÷3.6+27.2=

0.87×3. 16+4.64= 6.8×0.75÷0.5=

13.75÷0. 125–2.75= 53+23.4÷7.2=

2.88 1÷0.43-0.24×3.5= 28-(3.4+ 1.25×2.4)=

(3 1.8+3.2×4)÷5= 3 1.5×4÷(6+3)=

0.64×25×7.8+2.2= 2÷2.5+2.5÷2=

194-64.8÷ 1.8×0.9= 36.72÷4.25×9.9=

5 180-705×6= 24÷2.4-2.5×0.8=

3.4 16÷(0.0 16×35)=

Calculate the following problems in a simple way.

5. 12+2.54+4.88= 12.5× 17.8×0.8= 9.9×2.5=

9.4×5.8+ 10.6×5.8= 0. 125×0.32×0.25= 9.6+9.6×99=

2.8×7.6+ 1.4×2.8 +2.8= 6.3× 10. 1= 0.25×3.2× 12.5=

12.5×9.7? 12.5×8.7= 3.7×9 1.6+6.3×9 1.6=

16.84÷40÷0.25= 12.5×0.4×2.5×8= 9.5× 10 1=

4.2×7.8+2.2×4.2= 2.55×7. 1+2.45×7. 1=

Nine, solve the equation

4(x+0.3)= 4.8 1.2x-0.8x = 9.6 20+x = 36

7x-55 = 59 0.7 x = 4.2( 10-7.5)x = 1

X× 1.8 = 0.972 0.06×X = 1.02 X÷0. 13 = 0.7

12.4÷X=3 1

X. formula calculation

(1) 25 times a number is 37.75. What's this number?

(2) What is the number that is 42.5 greater than the quotient of 47.88 and 3.8?

(3) What is the difference between1.25 times 4.2 and 5?

(4) How much is 3.05 times more than 65438+4.7?

25 times a number is 37.5. What's this number?

(6) What is the number 42.5 greater than the quotient of 47.88 and 3.8?

60 is a multiple of 30 less than 3. What's this number?

Four times a number is 24 more than 60. What's this number?

(9) Multiply the sum of 14.8 1 and 5. 19 by their difference. What is the product?

What is the product of the sum of (10) 126.8 and 15.7 times 1.02?

(1 1)0.6 times 0.8 plus the product of 0. 12, and then divided by 1.2, what is the quotient?

XI。 Application problem

(1) The construction team dug a tunnel with a length of 0.7 km instead of 0.024 km per day, and it took 15 days. The rest will be completed in 10 days. How many days do you dig every day on average?

(2) Grade six students planted 276 trees, 20 more than grade five (1.5 times). How many trees were planted in the fifth grade?

(3) In the flood fighting and disaster relief fund-raising activities of Yuanming Primary School, the fifth and sixth grades donated 902 yuan. There are four classes in grade five, with an average donation of 90.5 yuan per class and four classes in grade six. What is the average donation per class? Mace is afraid of injury.