Quick calculation, skillful calculation 123 × 37 × 273 You can't just count

Quick calculation, skillful calculation 123 × 37 × 273 You can't just count

123×37×273
=123×(37×273)
=123×10101
=123×10000+123×100+123×1
=1242423

A simple calculation method of 116 △ 16

116÷16
=（100+16）/16
=100/16+16/16
=6 and 1 / 4 + 1
=7 and 1 / 4
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A simple method to calculate
⒈﹙14×15×48﹚÷﹙7×3×16﹚
2. 0.625 × 7 and 1 / 2 + 5 / 8 × 2 and 1 / 2-62.5% × 2
⒊1999+999×999
⒋ 33333×66666
⒌ 2009×20012001-2001×20092009

1 =(14/7)*(15/3)*(48/16)=2*5*3=30
2 =5/8*(7.5+2.5-2)=5/8*8=5
3 =1000+999+999*999=1000+999*(999+1)=1000+999*1000=1000*(999+1)=1000000
4 =33333*3*22222=99999*22222=(100000-1)*22222=2222200000-22222=2222177778
5 =2009*(2001*10000+2001)-2001*(2009*1000+2009)=2001*2009*(10000+1-10000-1)=0

Simple algorithm of 368-123 + 501-98-177

368-123+501-98-177
=(368-98)+501-(123+177)
=270+501-300
=270+(501-300)
=270+201
=471
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A simple method of 698-432 + 502-368

698+502-（432+368）=1200-800=400

Calculation of 216 + 305 with simple method
216+305
=216+300+5
=516+5
=521
Is this correct? The title requires simple calculation

This is correct
The best is: 216 + 305 = 200 + 16 + 300 + 5
=（200+300）+（16+5）
=500+21
=521.

Calculation of 214 × 215-213 × 216 by simple method

214×215-213×216
=214x(216-1)-213x216
=214x216-214-213x216
=(214-213)x216-214
=216-214
=2
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How to calculate 318-139-39 and 354 - (154 + 72) with simple method

The first is: 300 + 18-130-9-30-9 = 300-160 = 140
The second is: 300 + 54-100-54-72 = 200-72 = 128

Simple operation (123.456 + 234.561 + 345.612 + 456.123 + 561.234 + 612.345) △ 7, 3Q

(123.456+234.561+345.612+456.123+561.234+612.345)÷7 =[(1+2+3+4+5+6)X（100+10+1+0.1+0.01+0.001）]÷7 ＝（21X111.111）÷7 ＝（21÷7）X111.111 ＝3X111.111 ＝333.333

123 times 3 / 2 minus 246 times 1 / 4

123×3/2-246×1/4
=123×3/2-123×2×1/4
=123×(3/2-2×1/4)
=123×1
=123