Math 1A Workbook Exercise 49 and Review 4 Singapore Part 14
1A Workbook Exercise 49 and Review 4
Exercise 49
1. There
are many addition sentences and subtraction sentences in the puzzle. Find as
many from the puzzle as you can.
Solution:
Find the puzzle and solution in the below picture.
Review 4
1.
Write the numbers (as per below mentioned words).
(a) nine
(b) eight
(c) eleven
(d) twelve
(e) fourteen
(f) eighteen
(g) twenty
(h) seventeen
Solution:
(a) 9
(b) 8
(c) 11
(d) 12
(e) 14
(f) 18
(g) 20
(h) 17
2. Add and pair up the
number sentences.
6 + 7
= 10 + 6 =
9 + 3
= 10 + 3 =
8 + 8
= 10 + 4 =
7 + 7
= 10 + 2 =
Solution:
6 + 7
= 13. 10 + 6 = 16.
9 + 3
= 12. 10 + 3 = 13.
8 + 8
= 16. 10 + 4 = 14.
7 + 7
= 14. 10 + 2 = 12.
Pair up:
6 + 7
= 13. à 10 + 3 = 13.
9 + 3
= 12. à 10 + 2 = 12.
8 + 8
= 16. à 10 + 6 = 16.
7 + 7
= 14. à 10 + 4 = 14.
3. Write 2 (two)
addition sentences and 2 (two) subtraction sentences for the picture.
🦆. 🦆. 🦆. 🦆. 🦆. 🦆. 🦆.🦆. 🐤. 🐤. 🐤. 🐤. 🐤. 🐤.
Solution:
8 + 6 = 14.
6 + 8 = 14.
14 – 8 = 6.
14 – 6 = 8.
4. Fill in the missing numbers.
(a) 10 __ __ __ 14 __ __ 17 __ 19 __
(b) 20 __ 18 __ __ 15 __ __ __ __ __
Solution:
(a) Check out the
greatest number.
(b) Cross out the
smallest number.
19 17
15 9 12
Solution:
✔19 17
15 ❌9 12
6. What comes next?
(a)
|
●
● ● |
●●
●● ●● |
●●●
●●● ●●● |
(b)
1 - 3 -
5 - 7 - 9 - 11 -
Solution:
(a)
|
●●●●
●●●● ●●●● |
(b) 13
7. Fill in 1st,
2nd, 3rd and 4th to show the order (short to long).
Solution:
Solution:
M A T H E M A T I C S [colored 4th
letter as per the direction left to right]
M A T
H E M A T I C S [colored
4th letter as per the direction right to left]
9. Write the missing
numbers.
(a)
↗⬜
(b)
↗10
(c)
↗16
(d)
↗10
Solution:
(a) 10
(b) 8
(c) 0
(d) 10
10. Samy has 14
stamps. He buys 5 more. How many stamps does he have now?
Solution:
14 + 5
= 19.
He has
19 stamps now.
11. There are 12 ducks.
4 are swimming. How many ducks are not swimming?
Solution:
12 – 4
= 8.
8
ducks are not swimming.