Real-Life Estimation & Reasoning
During the community lunch, food was served in four time slots:
9:00am – 52 people
10:00am – 145 people
11:00am – 325 people
12:00pm – 508 people
A) If each person eats 2 chapatis, how many chapatis are needed in total? Show your steps.
B) The kitchen prepared only 950 chapatis. Did they prepare enough for everyone? How many more or less do they have?
Answers:
A)
Total people = 52 + 145 + 325 + 508 = 1,030
Total chapatis = 1,030 × 2 = 2,060 chapatis
B)
Chapatis needed = 2,060
Chapatis made = 950
They do not have enough;
Shortfall = 2,060 – 950 = 1,110 chapatis less
2. Data Interpretation & Comparison
In one month, the numbers of plates used in the langar (community kitchen) were recorded:
February: 1,213 plates
March: 2,121 plates
September: 1,236 plates
October: 2,021 plates
A) In which month was the minimum and maximum number of plates used?
B) What is the difference between the month with the most and least plates used?
C) Write the plate usage for each month in ascending order.
Answers:
A)
Minimum: 1,213 (February)
Maximum: 2,121 (March)
B)
Difference = 2,121 – 1,213 = 908 plates
C)
Ascending order:
1,213 (Feb), 1,236 (Sep), 2,021 (Oct), 2,121 (Mar)
3. Place Value Understanding
Jaspreet receives a donation of 100 – 7 packets of rice. Express this number in words and in expanded form.
Answer:
100 – 7 = 93
In words: Ninety-three
Expanded form: 90 + 3
4. Reasoning through Rounding
The organisers planned for 1,000 guests. Exactly 988 people came.
A) Is it reasonable to say “about one thousand people came”? Explain your answer with reference to rounding.
Answer:
Yes, because 988 is closer to 1,000 than to 900. When rounded to the nearest hundred or thousand, 988 rounds to 1,000, so it is reasonable to say “about one thousand people came”.
5. Create and Solve: Four-Digit Number Challenge
Using each digit once, what is the largest and the smallest 4-digit number you can form from the donations: 2, 4, 7, 3?
Answer:
Largest: 7,432
Smallest: 2,347
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