Numbers to 100 and place value – Year 1 maths worksheet answers to download as PDF

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1. Answer to Question 1

   1. 23: 2 tens and 3 ones. 23 = 20 + 3.
   2. 48: 4 tens and 8 ones. 48 = 40 + 8.
   3. 60: 6 tens and 0 ones. 60 = 60 + 0.
   4. 75: 7 tens and 5 ones. 75 = 70 + 5.
   5. 91: 9 tens and 1 ones. 91 = 90 + 1.

2. Answer to Question 2

   1. 4 tens is 40 and 6 ones is 6. Put them together: 40 + 6 = 46.
   2. 7 tens is 70 and there are no ones, so the ones digit is 0: 70.
   3. 2 tens is 20 and 9 ones is 9: 20 + 9 = 29.
   4. 50 is 5 tens and 3 is 3 ones, so the number is 53.
   5. 80 is 8 tens and 8 is 8 ones, so the number is 88. The two 8s mean different things: 80 and 8.

3. Answer to Question 3

   1. 13 is a teen number: thirteen.
   2. 27 is 2 tens and 7 ones: twenty and seven, written twenty-seven with a hyphen.
   3. 45 is 4 tens and 5 ones: forty-five. Be careful: forty has no u.
   4. 68 is 6 tens and 8 ones: sixty-eight.
   5. 90 is 9 tens and no ones, so it is just ninety.

4. Answer to Question 4

   1. Go down one row. 24 → 34.
   2. 58 → 68.
   3. Go up one row. 47 → 37.
   4. 90 → 80.
   5. One more than 39 is 40 (9 ones and 1 more makes a new ten).

5. Answer to Question 5

   1. Counting in 2s adds 2 each time: 2, 4, 6, 8, 10, 12.
   2. Counting in 5s adds 5 each time: 5, 10, 15, 20, 25, 30.
   3. Counting in 10s adds 1 to the tens digit each time: 10, 20, 30, 40, 50, 60.
   4. From 16, add 2 more: 12, 14, 16, 18, 20.
   5. Counting back in 10s takes 1 away from the tens digit: 100, 90, 80, 70.

6. Answer to Question 6

   1. 3 tens is less than 5 tens: 35 < 53.
   2. 7 tens is more than 2 tens: 72 > 27.
   3. The same number: 48 = 48.
   4. The tens are 6 and 5: 60 > 59.
   5. 1 ten and 4 ones is less than 4 tens: 14 < 41.

7. Answer to Question 7

   1. Each full box holds 10. Count in tens for 3 boxes: 10, 20, 30. There are 30 eggs in the boxes.
   2. Add the 6 loose eggs to the 30: 3 tens and 6 ones make 36 eggs.
   3. 36 is 3 tens and 6 ones, so we write thirty-six.
   4. 10 more adds 1 to the tens digit: 36 becomes 46 eggs. The ones digit stays 6.

8. Answer to Question 8

   1. Each bag has 10 sweets. Count in tens for 4 bags: 10, 20, 30, 40. Max has 40 sweets.
   2. Lily has 2 bags, which is 2 tens or 20, and 5 loose sweets, which is 5 ones: 20 + 5 = 25 sweets.
   3. Compare the tens: 40 has 4 tens and 25 has only 2 tens. So 40 > 25 and Max has more sweets.
   4. Lily gets one more ten, so her tens digit goes up by 1: 25 + 10 = 35 sweets.

9. Answer to Question 9

   1. 5 tens and 6 ones.
   2. 56 + 10 = 66 children.
   3. sixty-six.
   4. 66 − 20 = 46. Two tens are taken away, so the tens digit goes from 6 to 4.

10. Answer to Question 10

    1. Count in 5s, one number for each group of stickers: 5, 10, 15, 20, 25, 30.
    2. The last number said is 30, so there are 30 stickers in all.
    3. One more group adds 5: 30 + 5 = 35 stickers.
    4. 35 comes after 30 when we count, so 35 > 30. Anya has more than 30 stickers now.

11. Answer to Question 11

    1. Compare the tens digits: Sam 2 tens, Meg 4 tens, Ali 2 tens. 4 tens is the most, so Meg swims the most lengths.
    2. 24 and 29 both have 2 tens, so look at the ones: 4 is less than 9. Then 42 is the biggest. The order is 24, 29, 42.
    3. 10 more adds 1 to the tens digit: 29 + 10 = 39 lengths.
    4. 39 has 3 tens and Sam's 24 has 2 tens, so 39 > 24. Ali has swum more than Sam.

12. Answer to Question 12

    1. 50 has 5 tens. 80 has 8 tens.
    2. 70 > 50, so Dev has read more.
    3. 60, 70, 80. That is 3 steps, so 3 tens (30 pages).
    4. 3 tens = 30 pages. Check: 70 + 30 = 100.

13. Answer to Question 13

    1. Each carriage holds 2 animals. Count in 2s for 8 carriages: 2, 4, 6, 8, 10, 12, 14, 16.
    2. The last number is 16, so there are 16 animals on the train.
    3. Two carriages hold 2 + 2 = 4 animals. Take them away: 16 − 4 = 12 animals left.
    4. 12 is a special number word: twelve.

14. Answer to Question 14

    1. A is one more than 34. 35.
    2. B is between 43 and 45. 44.
    3. C is one more than 55. 56.
    4. Below 55 is 10 more. 65.
    5. Above 34 is 10 less. 24.

15. Answer to Question 15

    1. 63 is 6 tens and 3 ones. Hana has 6 piles and 3 loose buttons.
    2. 6 tens and 8 ones is 60 + 8 = 68 buttons.
    3. The tens are the same (6). Compare ones: 3 < 8. So 63 < 68 and Eli has more.
    4. 68 → 69 → 70. Eli needs 2 more.

16. Answer to Question 16

    1. 45 is between 40 and 50 on the number line. Yes, she is right.
    2. 55, 65, 75, 85, 95.
    3. There are 5 numbers, so 5 tens (50 more days). Check: 45 + 50 = 95.
    4. one hundred.

17. Answer to Question 17

    1. 2, 4, 6, 8, 10, 12, 14. 14 gloves.
    2. 5, 10, 15, 20, 25, 30. 30 fingers.
    3. 30 > 14, so the fingers.
    4. Count on from 14 in 2s ... or take away: 30 − 14 = 16.

18. Answer to Question 18

    1. 10, 20, ... 90. 90 seats.
    2. 10, 20, 30, 40. 40 seats.
    3. 90 > 40: the big bus has more.
    4. One more row is 10 more seats. 90 + 10 = 100. Yes.

19. Answer to Question 19

    1. Put the biggest digit in the tens place: 75.
    2. Put the smallest digit in the tens place: 35.
    3. Start with 5 tens: 53 or 57. For example 57.
    4. In 53 and 57 the 5 is in the tens place, so it is worth 50. In 35 and 75 it is worth 5. The answer is 53 and 57.

20. Answer to Question 20

    1. 6 tens is 60 and 7 ones is 7. 60 + 7 = 67.
    2. Both digits the same between 40 and 50: 44.
    3. 10, 20, 30, 40, 50.
    4. 100 − 10 = 90, which is ninety.