Question

1. Find the sum by suitable rearrangement:
(a) 647 + 206 +953
(b) 218 +352 + 1982 + 648
(c) 15,508 +522 +592 + 178
(d) 11 + 12 +13 + 14 +86 +87 -88 +89
(e) 2,258 + 9,982 +3,642 + 10,018
2. Find the product by suitable rearrangement:
(a) 4 x 525 x 25
(b) 125 x 458 x 8
(c) 25 x 50 x 8 x 20
(d) 250 x 80 x 5x8
(e) 625 x 25 x 16 x 8
81​

Answer 1

Step-by-step explanation:

1. a) (647+953)+206

1600+206

1806

b) (218+1982)+(352+648)

2200+1000

3200

c) (15508+592)+(522+178)

16100+700

16800

d) (11+89)+(12+88)+(13+87)+(14+86)

100+100+100+100

400

e) (2258+3642)+(9982+10018)

5900+20000

25900

NOTE: In 2.(d), I used +88 instead of -88 as I thought there was a small error in the question.