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Simple calculation of 0.56 times 301
0.56×301
=0.56×（300+1）
=0.56×300+0.56
=168+0.56
=168.56
Simple calculation of grade 4: 236-89 + 56-87 / 3
How to calculate
236-89+56-87/3
=230+6-90+1+50+6-29
=230-90+50-30+1+1+6+6 = 160+14=174
3.56×3.5+0.356×65
Clever calculation
3.56×3.5+0.356×65=3.56×3.5+3.56×6.5=3.56×(3.5+6.5)=3.56×10=35.6
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