Primary 4 Mathematics · Chapter 1 · Answers and explanations
Lesson 1.3: Comparing and Ordering Numbers
Use this page to check the practice sheet together. Talk about why each answer is right. Total: 15 marks.
Section A · Multiple choice 4 marks
1. Which sign goes in the box?
45 210 □ 45 1201 mark
(A) <(B) >(C) =(D) cannot tell
Answer: (B) >Both have 4 and 5 in the first two places. In the hundreds place 2 is greater than 1, so 45 210 > 45 120.
2. Which number is the greatest?1 mark
(A) 38 904(B) 39 804(C) 38 940(D) 39 084
Answer: (B) 39 804Compare the thousands first: 39 is greater than 38. Of 39 804 and 39 084, the hundreds decide: 8 > 0.
3. Which number is the smallest?1 mark
(A) 62 015(B) 60 215(C) 62 105(D) 60 125
Answer: (D) 60 125The thousands digit 0 is smallest in 60 215 and 60 125. Then the hundreds decide: 1 < 2, so 60 125.
4. Which list is in order from smallest to greatest?1 mark
(A) 21 305, 20 315, 20 135(B) 20 135, 20 315, 21 305(C) 20 315, 20 135, 21 305(D) 21 305, 20 135, 20 315
Answer: (B) 20 135, 20 315, 21 30520 135 < 20 315 < 21 305. Compare thousands, then hundreds.
Section B · Write your answer 11 marks
5. Write < or > in the box: 9876 □ 10 0001 mark
Answer: <9876 has 4 digits and 10 000 has 5 digits. The number with fewer digits is smaller.
6. Write < or > in the box: 70 450 □ 70 5401 mark
Answer: <The first three digits are the same. The hundreds digits are 4 and 5, so 70 450 < 70 540.
7. Arrange from greatest to smallest:
40 381, 41 308, 40 813, 41 0382 marks
Answer: 41 308, 41 038, 40 813, 40 381Compare thousands, then hundreds, then tens: 41 308, 41 038, 40 813, 40 381.
8. Use the digits 4, 0, 7, 9 and 2 once each. Write the greatest 5-digit number you can make.1 mark
Answer: 97 420Put the biggest digits in the biggest places: 9, 7, 4, 2, 0.
9. Use the same digits. Write the smallest 5-digit number you can make.2 marks
Answer: 20 479The smallest digit 0 cannot go first, so start with 2. Then 0, 4, 7, 9: 20 479.
10. What whole number is between 36 499 and 36 501?1 mark
Answer: 36 500Counting up: 36 499, 36 500, 36 501.
11. Two schools have 18 340 and 18 430 books. Which school has more books? Write the number.1 mark
Answer: 18 430The thousands are the same. The hundreds are 3 and 4, so 18 430 is greater.
12. Write the smallest digit for the box so that 3□ 450 > 36 450 is true.2 marks
Answer: 7The box is in the thousands place. It must be greater than 6, so the smallest digit is 7: 37 450 > 36 450.
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