Ans: (b) Explanation: When we multiply any number by 10, we add one zero to the end of the number. So \(6 \times 10 = 60\). Option (a) is incorrect because it shows addition instead of multiplication. Option (c) adds two zeros. Option (d) is incorrect because it shows the digits placed next to each other.
Q2: Which number sentence is correct? (a) 10 × 9 = 19 (b) 10 × 9 = 90 (c) 10 × 9 = 910 (d) 10 × 9 = 109
Solution:
Ans: (b) Explanation: \(10 \times 9 = 90\). When we multiply 9 by 10, we add one zero to 9, which gives us 90. The other options show common mistakes like adding the digits together or placing them side by side.
Q3: Sarah has 4 boxes with 10 pencils in each box. How many pencils does she have in total? (a) 14 pencils (b) 40 pencils (c) 400 pencils (d) 44 pencils
Solution:
Ans: (b) Explanation: We need to multiply \(4 \times 10 = 40\). Sarah has 40 pencils in total. Option (a) shows addition instead of multiplication. Option (c) adds two zeros instead of one. Option (d) incorrectly combines the digits.
Q4: What pattern do you notice when multiplying by 10? (a) The number stays the same (b) You add one zero to the end of the number (c) You subtract 10 from the number (d) You add 10 to the number
Solution:
Ans: (b) Explanation: The pattern when multiplying by 10 is that we add one zero to the end of the number. For example, \(7 \times 10 = 70\), \(12 \times 10 = 120\). This rule works for all whole numbers.
Q5: What is 10 × 15? (a) 25 (b) 105 (c) 150 (d) 1,500
Solution:
Ans: (c) Explanation: When we multiply \(10 \times 15\), we add one zero to the end of 15, which gives us 150. Option (a) shows addition. Option (b) places the digits side by side. Option (d) adds two zeros instead of one.
Q6: Which multiplication fact is equal to 80? (a) 8 × 1 (b) 8 × 10 (c) 8 × 100 (d) 8 + 10
Solution:
Ans: (b) Explanation: \(8 \times 10 = 80\). When we multiply 8 by 10, we get 80. Option (a) equals 8. Option (c) equals 800. Option (d) shows addition, which equals 18.
Q7: If 3 × 10 = 30, then what is 30 ÷ 10? (a) 3 (b) 10 (c) 30 (d) 300
Solution:
Ans: (a) Explanation: Division is the inverse operation of multiplication. Since \(3 \times 10 = 30\), then \(30 \div 10 = 3\). We reverse the multiplication to find the original number.
Q8: A farmer plants 10 rows of corn with 12 plants in each row. How many corn plants are there altogether? (a) 22 plants (b) 102 plants (c) 120 plants (d) 1,200 plants
Solution:
Ans: (c) Explanation: We multiply \(10 \times 12 = 120\). Add one zero to 12 to get 120 plants. Option (a) shows addition. Option (b) places digits side by side. Option (d) adds two zeros.
Section B: Fill in the Blanks
Q9: When you multiply any number by 10, you add __________ zero(s) to the end of the number.
Solution:
Ans: one Explanation: The rule for multiplying by 10 is to add one zero to the end of the number. For example, \(5 \times 10 = 50\).
Q10: 7 × 10 = __________
Solution:
Ans: 70 Explanation: Multiplying 7 by 10 gives us 70. We add one zero to 7.
Q11: 10 × 20 = __________
Solution:
Ans: 200 Explanation: When we multiply 20 by 10, we add one zero to 20, which gives us 200. The calculation is \(10 \times 20 = 200\).
Q12: If 10 × 8 = 80, then 80 ÷ 10 = __________
Solution:
Ans: 8 Explanation: Division is the inverse of multiplication. Since \(10 \times 8 = 80\), dividing 80 by 10 gives us back 8.
Q13: 100 is the same as 10 × __________
Solution:
Ans: 10 Explanation: \(10 \times 10 = 100\). When we multiply 10 by itself, we get 100.
Q14: The product of 10 and 11 is __________
Solution:
Ans: 110 Explanation: The word product means the answer to a multiplication problem. \(10 \times 11 = 110\).
Section C: Word Problems
Q15: A school library receives 10 boxes of books. Each box contains 25 books. How many books did the library receive in total?
Solution:
Ans: \(10 \times 25 = 250\) Final Answer: 250 books
Q16: Maria runs 10 laps around the track every day. If each lap is 8 meters long, how many meters does she run each day?
Solution:
Ans: \(10 \times 8 = 80\) Final Answer: 80 meters
Q17: A toy store sells action figures in packs of 10. If they sold 13 packs yesterday, how many action figures were sold?
shortcuts and tricks, Summary, past year papers, video lectures, MCQs, Semester Notes, Extra Questions, Viva Questions, practice quizzes, pdf , Worksheet (with Solutions): Multiply By 10s, Exam, Objective type Questions, Previous Year Questions with Solutions, Worksheet (with Solutions): Multiply By 10s, study material, mock tests for examination, ppt, Important questions, Sample Paper, Free, Worksheet (with Solutions): Multiply By 10s;
