Math 1A Workbook Exercise 49 and Review 4 Singapore Part 14

addition sentences and subtraction sentences, puzzle and solution, 1A Workbook Exercise Singapore, Write the numbers, Add and pair up,

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:



5.

(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:



8. Color the 4th letter of this word: M A T H E M A T I C S

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)

     

14
     4

(b)

     10

18
     

(c)

     16

16
     

(d)

     10

20
     

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.

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