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Vidaara.orgClass 4 · Mathematics
CodeVID-M04-02-EST-01
Estimating Products - Assignment
Chapter: Multi-Digit Multiplication
Topic: Estimate Products Before Calculating
Maximum Marks: 35
Time: 75 minutes
Name: ____________________ Roll No.: __________ Date: ____________

General Instructions

  • All questions are compulsory.
  • Section A carries 1 mark each, Section B 2 marks, Section C 3 marks and Section D 5 marks.
  • Show all working for Sections B, C and D. Only final answers are given at the end — for full solutions, raise your doubts with your teacher.
Section A — Multiple Choice Questions 5 × 1 = 5 marks
1.
To estimate a product, you first:
  • A.add the numbers
  • B.round each number
  • C.subtract
  • D.divide
2.
$48\times21$ is about:
  • A.$1000$
  • B.$100$
  • C.$500$
  • D.$2000$
3.
Rounding $31$ to the nearest ten gives:
  • A.$30$
  • B.$40$
  • C.$31$
  • D.$300$
4.
An estimate is:
  • A.always exact
  • B.close to the exact answer
  • C.always larger
  • D.always smaller
5.
Estimation helps check if an answer is:
  • A.prime
  • B.reasonable
  • C.even
  • D.negative
Section B — Short Answer (2 marks) 4 × 2 = 8 marks
6.
Estimate $19\times21$.
7.
Estimate $38\times11$.
8.
Estimate $52\times9$.
9.
Round $47$ to the nearest ten.
Section C — Short Answer (3 marks) 4 × 3 = 12 marks
10.
Estimate $28\times32$.
11.
Estimate $61\times19$.
12.
Estimate $88\times41$.
13.
Estimate $199\times5$.
Section D — Long Answer (5 marks) 2 × 5 = 10 marks
14.
Estimate $48\times53$, then find the exact product.
15.
A shop sells $39$ boxes with $21$ pens each. Estimate the total, then find the exact number.

Answer Key

Section A — Multiple Choice Questions
  1. (B) round each number
  2. (A) $1000$
  3. (A) $30$
  4. (B) close to the exact answer
  5. (B) reasonable
Section B — Short Answer (2 marks)
  1. $\approx400$ ($20\times20$).
  2. $\approx400$ ($40\times10$).
  3. $\approx500$ ($50\times10$).
  4. $50$.
Section C — Short Answer (3 marks)
  1. $\approx900$ ($30\times30$).
  2. $\approx1200$ ($60\times20$).
  3. $\approx3600$ ($90\times40$).
  4. $\approx1000$ ($200\times5$).
Section D — Long Answer (5 marks)
  1. Estimate $2500$; exact $2544$.
  2. Estimate $800$; exact $819$.
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