Question

Please help In 19. and 20. th question

Answer 1

Answer:

19

a 582

b 1,340

c 1,106

d 4,68,000

20.

a 68,646

b 90288

Answer 2

Answer:

625+182+375

=600+25+100+80+2+300+75

=(600+100+300)+(25+75)+82

=1000+100+82

=1182

2×134×5

=2×(100+30+4)×5

=(200+60+8)×5

=1000+300+40

=1340

8×468×125

=8×(400+60+8)×(100+20+5)

=(3200+480+64)×(100+20+5)

={(3200+480+64)×100}+{(3200+480+64)×20}+{(3200+480+64)×5}

={320000+48000+6400}+{64000+9600+1280}

={320000. {64000

+ 48000. 9600

+ 6400}. 1280}

=374400. + (74880)

=374400

+ 74880

=449280

Step-by-step explanation:

673×102={600+70+3}{100+2}={600+70+3}100 + {600+70+3}2 = (60000+7000+300)+(1200+140+6) =67300+1346=68646

912×99=(900+10+2)(90+9)

=(900+10+2)90 + (900+10+2)9

=(81000+900+180)+(8100+90+18)

=(81000+1180)+(8100+118)

=82180+8218

=90398