Class 7- Computational Thinking- Chapter 1- Large Numbers Around Us

Chapter 1: Large Numbers Around Us – Student-Friendly Summaries 1. Highest Possible Value of Y X is a 6-digit number made using: • one digit appearing once • one digit appearing twice • one digit appearing three times When 2,00,000 is added to X, the result Y must still be a 6-digit number. To get the largest value: • X should begin with 7 • digit 9 should appear 3 times • digit 8 should appear 2 times Largest possible X: 799988 Add 2,00,000: 799988 + 200000 = 999988 Answer: Option c ________________________________________ 2. Product of Numbers on a Telephone Dial Pad A telephone dial pad contains: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 When multiplying all numbers: • any number multiplied by 0 becomes 0 So, the product is 0. Since 0 is not in the options: Answer: Option d ________________________________________ 3. Difference Between X and Y Y: • ends with 0 • has only one even digit • digits are in descending order So: Y = 975310 9 is in the same position in X. To make X the largest possible number: X = 984620 Difference: 984620 − 975310 = 9310 Answer: Option a ________________________________________ 4. Replacing the Grey Circle The grey circle must be replaced with the greatest digit that keeps the comparison true. Example: 178727 greater than 177827 This works only up to digit 7. For the question: 555065 less than 555605 The comparison works only up to digit 5. Answer: Option c ________________________________________ 5. Counting Remaining Zeros Rule: • Number of letters after “–” tells how many zeros are removed. Example: Crore = 1,00,00,000 → 7 zeros “re” has 2 letters Remaining zeros: 7 − 2 = 5 zeros For: Lakh = 1,00,000 → 5 zeros “kh” has 2 letters Remaining zeros: 5 − 2 = 3 zeros Answer: Option c ________________________________________ 6. Forming 6-Digit Numbers Conditions: • hundreds digit is double the thousands digit • no consecutive digits are together • first and last digits have the smallest difference Possible valid numbers: • 752418 • 274851 Both numbers lie between 2 lakhs and 8 lakhs. Total numbers = 2 Answer: Option b ________________________________________ 7. Maximum Difference Between Two Numbers Number 1: _ 1 _ 9 _ Number 2: _ 4 _ 6 _ Rules: • no consecutive digits in the same number Possible digits: • Number 1 → 3, 5, 7 • Number 2 → 0, 2, 8 To maximize difference: • maximize Number 2 • minimize Number 1 Numbers formed: • 31597 • 84260 Difference: 84260 − 31597 = 52663 Answer: Option b ________________________________________ 8. Finding E’s Number Card Cards: • 100 • 1000 • 10000 • 100000 • 1000000 Using the clues: • C = ten thousand • A = one hundred • D = ten lakh • B = one thousand Remaining card: • one lakh So, E has one lakh. Answer: Option c ________________________________________ 9. Calvin’s Profession and Salary Given: • Bob = Lawyer • David = Engineer • Cricketer earns the highest salary Doctor earns ₹50,000. David earns ₹40,000. Alex earns more than Bob, so: • Alex = Cricketer = ₹70,000 Therefore: • Calvin = Doctor = ₹50,000 Answer: Option c ________________________________________ 10. Nisha’s Laptop Password Convert each clue into numbers: • 14 ten thousands = 1,40,000 • 31 thousands = 31,000 • 423 hundreds = 42,300 • 35 tens = 350 • 25 ones = 25 Add all values: 1,40,000 + 31,000 + 42,300 + 350 + 25 = 2,13,675 Password: 213675 Answer: Option d Columns Puzzle Column with the Highest Sum Rules: • number appears as many times as its value • Column A is the only column with 3 different numbers Column A: 2, 3, 4 Remaining placements: • one 3 • three 4s Column sums: • Column A = 9 • Column B = 10 • Column C = 10 Highest sum: Both Columns B and C Answer: Option d Chapter 1- Large Numbers Around Us - Computational Thinking- Q1 to 10 & Thinking spot SSC Exams (कर्मचारी चयन आयोग) #ssc #ssccgl #chsl #sscmts #sscgd #sscje #ssccpo Banking Exams (बैंकिंग परीक्षाएं) #ibps #ibpspo #ibpsclerk #sbipo #sbiclerk #rbiassistant #rbigradeb Civil Services & State Exams (यूपीएससी और राज्य स्तरीय परीक्षाएं) #upsc #ias #ips #upsccs #pcs #uppcs (या आपके राज्य के अनुसार, जैसे: #bpsc, #mppsc, #ras) Railways Exams (रेलवे भर्ती) #rrb #rrbntpc #rrbgroupd #rrbalp Teaching Exams (शिक्षक पात्रता परीक्षा) #ctet #uptet #stet #tgtpgt #kvs #nvs Defense & Police Exams (रक्षा और पुलिस बल) #nda #cds #afcat #delhipolice #uppolice #agniveer General Educational & Trending Hashtags #governmentexams #sarkarinaukri #competitiveexams #examprep #gkonline #currentaffairs #studygramindia #computationalthinking #creativethinking #criticalthinking #logicalreasoning #logicalthinking #class7computationalthinking #grade7 #ncertsolutionsmaths #mathmatters #education #educationalvideoforchildren #explanationsinenglish #entranceexam #olympiadclass7 #competitiveexams #namitarajput #IMO #NSO #IIO