Question

900 repeated subtraction
400 repeated subtraction​

Answer 1

Answer:

900 repeated subtraction = 30

400 repeated subtraction​ = 20                    

400-1=399

399-3=396

396-5=391

391-7=384

384-9=375

375-11=364

364-13=351

351-15=336

336-17=319

319-19=300

300-21=279

279-23=256

256-25=231

231-27=204

204-29=175

175-31=144

144-33=111

111-35=76

76-37=39

39-39=0

thus no. of steps =20

so √400=20

Step-by-step explanation:

Hope my answer and steps help you!!

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Answer 2

Answer:

Repated subtraction of 400:

400-1=399

399-3=396

396-5=391

391-7=384

384-9=375

375-11=364

364-13=351

351-15=336

336-17=319

319-19=300

300-21=279

279-23=256

256-25=231

231-27=204

204-29=175

175-31=144

144-33=111

111-35=76

76-37=39

39-39=0

Repeated subtraction of 900:

900-1=899

899-3=896

896-7=889

889-9=880

880-11=869

869-13=855

855-15=840

840-17=823

823-19=804

And then subtract more and more then you will get the answer 30 and then do 30-30 that is equal to=0.

I was tired doing it...so, I did till this much...I hope u can do it now : )

Hope it helps

Mark as brainliest