First, write the number directly.
0.5×8= 3.6×0.4= 39.68×0= 47.6× 1=
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=