Answers

1. Answer:

   1) 1) 97 – 39. It becomes

   100 – 40 = 60

   2)2) 812,344 – 187,675. It becomes

   800000 – 200000 = 600000

   3)321 + 79. It becomes

   300 + 80 = 410

   4) 315 x 821. It becomes

   300 + 800 = 1100

   5) 562 x 791. It becomes

   600× 800 = 480000

   6) 82 x 156. It becomes

   80×200 = 16000

   7) 711 x 884. It becomes

   700×900 = 630000

   8) 126 x 952. It becomes

   100×1000 = 100000

   9) 824 x 541. It becomes

   800× 500 = 400000

   10) 4027 x 78. It becomes

   4000×80 = 320000

   11) 796 x 123. It becomes

   800×100 = 80000

   12) 817 19. It becomes

   800/20 = 40

   13) 3615 72. It becomes

   4000/70 = 57.1 = 60

   14) 232 64. It becomes

   200/60 = 33.3 = 30

   15) 559 81. It becomes

   600/80 = 7.5 = 8

   16) 2986 222. It becomes

   3000/200 = 15

   17) 10275 232. It becomes

   10000/200 = 50

   18) 7428 286. It becomes

   7000/300 = 23.3 = 20

   19) 7143 369. It becomes

   7000/400 = 17.5 = 18

   20) 628,597 1525, it becomes

   600000 – 2000 = 300

   Step-by-step explanation:

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