Primary 4 Mathematics · Chapter 1 · Answers and explanations
Lesson 1.1: Counting to 100 000
Use this page to check the practice sheet together. Talk about why each answer is right. Total: 13 marks.
Section A · Multiple choice 4 marks
1. Which number is forty-two thousand, five hundred and nine?1 mark
(A) 40 259(B) 42 509(C) 42 059(D) 4259
Answer: (B) 42 50942 thousand, 5 hundred and 9. There are no tens, so the tens place is 0: 42 509.
2. Which number is seventy thousand and sixty?1 mark
(A) 70 600(B) 7060(C) 70 060(D) 60 070
Answer: (C) 70 06070 thousand and 60. There are no hundreds, so the hundreds digit is 0: 70 060.
3. What number is 1 more than 39 999?1 mark
(A) 39 000(B) 49 999(C) 39 100(D) 40 000
Answer: (D) 40 000Every 9 carries over: 39 999 + 1 = 40 000.
4. What number is 100 less than 20 050?1 mark
(A) 19 950(B) 20 040(C) 19 050(D) 20 150
Answer: (A) 19 95020 050 − 100: regroup one thousand. 20 050 − 100 = 19 950.
Section B · Write your answer 9 marks
5. Write 54 306 in words.1 mark
Answer: fifty-four thousand, three hundred and six54 thousand, 3 hundred and 6: fifty-four thousand, three hundred and six.
6. Write ninety thousand, four hundred and five in numerals.1 mark
Answer: 90 40590 thousand, 4 hundred and 5. The tens digit is 0: 90 405.
7. What number is 10 more than 68 995?1 mark
Answer: 69 00568 995 + 10 = 69 005. The tens and hundreds carry.
8. What number is 1000 less than 100 000?1 mark
Answer: 99 000100 000 − 1000 = 99 000.
9. Write the number with 3 ten thousands, 0 thousands, 7 hundreds, 0 tens and 2 ones.1 mark
Answer: 30 70230 000 + 700 + 2 = 30 702.
10. Counting in ten thousands: 10 000, 20 000, ____, ____, 50 000. Fill in the two missing numbers.2 marks
Answer: 30 000 and 40 000Add 10 000 each time: 30 000 and 40 000.
11. What is 1 more than 79 999? Say what happens to the digits.2 marks
Answer: 80 000. Each 9 carries, so the 9s become 0 and the 7 becomes 8.79 999 + 1 = 80 000. All four 9s carry over and the ten-thousands digit goes up by 1.
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