Primary 4 Mathematics · Chapter 1 · Answers and explanations
Lesson 1.4: Number Patterns
Use this page to check the practice sheet together. Talk about why each answer is right. Total: 16 marks.
Section A · Multiple choice 4 marks
1. What is the rule? 12 300, 12 400, 12 500, 12 6001 mark
(A) add 10(B) add 1000(C) add 100(D) add 10 000
Answer: (C) add 100Each number is 100 more than the one before. The hundreds digit goes up by 1.
2. What is the next number? 48 000, 38 000, 28 000, ?1 mark
(A) 18 000(B) 27 000(C) 38 000(D) 8000
Answer: (A) 18 000The rule is subtract 10 000: 28 000 − 10 000 = 18 000.
3. What is the missing number? 5090, 5100, ____, 51201 mark
(A) 5105(B) 5111(C) 5200(D) 5110
Answer: (D) 5110The rule is add 10: 5090, 5100, 5110, 5120.
4. Which pattern has the rule subtract 10 000?1 mark
(A) 20 000, 30 000, 40 000(B) 75 000, 65 000, 55 000(C) 75 000, 74 000, 73 000(D) 75 000, 74 900, 74 800
Answer: (B) 75 000, 65 000, 55 00075 000, 65 000, 55 000 goes down by 10 000 each time.
Section B · Write your answer 12 marks
5. Continue the pattern: 9970, 9980, 9990, ____, ____2 marks
Answer: 10 000 and 10 010Add 10 each time. 9990 + 10 = 10 000, then 10 010.
6. Count back: 30 200, 30 100, 30 000, ____, ____2 marks
Answer: 29 900 and 29 800Subtract 100 each time. 30 000 − 100 = 29 900, then 29 800.
7. Find the missing number: 24 600, ____, 26 600, 27 6001 mark
Answer: 25 600The rule is add 1000: 24 600, 25 600, 26 600, 27 600.
8. A pattern starts at 15 000 and goes up by 10 000 each time. What is the 4th number?1 mark
Answer: 45 00015 000, 25 000, 35 000, 45 000.
9. Write the rule: 80 000, 70 000, 60 000, 50 0001 mark
Answer: subtract 10 000Each number is 10 000 less than the one before.
10. What comes next? 9980, 9990, 10 000, ?1 mark
Answer: 10 010Add 10 each time: 10 000 + 10 = 10 010.
11. Fill in the two missing numbers: 62 500, ____, 62 700, ____, 62 9002 marks
Answer: 62 600 and 62 800The rule is add 100: 62 500, 62 600, 62 700, 62 800, 62 900.
12. A pattern starts at 100 000 and goes down by 10 000 each time. Write the first four numbers and circle the 4th.2 marks
Answer: 100 000, 90 000, 80 000, 70 000 (4th number: 70 000)100 000 − 10 000 = 90 000, then 80 000, then 70 000.
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