Math 1A Workbook Exercise 40-44 Singapore Part 12
1A Workbook Exercise 40-44
Exercise 40
1.
Add.
10 + 3 =
8 + 10 =
6 + 10 =
10 + 7 =
10 + 2 =
10 + 5 =
4 + 10 =
1 + 10 =
Solution:
10 + 3 = 13.
8 + 10 = 18.
6 + 10 = 16.
10 + 7 = 17.
10 + 2 = 12.
10 + 5 = 15.
4 + 10 = 14.
1 + 10 = 11.
2.
Add.
7 + 5 =
9 + 7 =
4 + 9 =
8 + 5 =
3 + 8 =
6 + 7 =
2 + 9 =
7 + 8 =
Solution:
7 + 5 = 12.
9 + 7 = 16.
4 + 9 = 13.
8 + 5 = 13.
3 + 8 = 11.
6 + 7 = 13.
2 + 9 = 11.
7 + 8 = 15.
Exercise 41
1.
Add.
3 + 9 =
6 + 8 =
9 + 6 =
5 + 7 =
8 + 6 =
9 + 2 =
9 + 5 =
8 + 4 =
Solution:
3 + 9 = 12.
6 + 8 = 14.
9 + 6 = 15.
5 + 7 = 12.
8 + 6 = 14.
9 + 2 = 11.
9 + 5 = 14.
8 + 4 = 12.
2. Add.
6 + 7 =
8 + 3 =
4 + 7 =
6 + 9 =
7 + 6 =
9 + 9 =
3 + 8 =
7 + 4 =
Solution:
6 + 7 = 13.
8 + 3 = 11.
4 + 7 = 11.
6 + 9 = 15.
7 + 6 = 13.
9 + 9 = 18.
3 + 8 = 11.
7 + 4 = 11.
Exercise 42
1.
Add.
12 + 3 =
16 + 3 =
5 + 12 =
12 + 6 =
4 + 15 =
15 + 3 =
17 + 3 =
8 + 11 =
Solution:
12 + 3 = 15.
16 + 3 = 19.
5 + 12 = 17.
12 + 6 = 18.
4 + 15 = 19.
15 + 3 = 18.
17 + 3 = 20.
8 + 11 = 19.
2.
Add.
14 + 5 =
7 + 11 =
16 + 4 =
3 + 13 =
2 + 15 =
14 + 4 =
13 + 4 =
12 + 5 =
Solution:
14 + 5 = 19.
7 + 11 = 18.
16 + 4 = 20.
3 + 13 = 16.
2 + 15 = 17.
14 + 4 = 18.
13 + 4 = 17.
12 + 5 = 17.
3.
Complete the addition sentences for each picture.
10 + 10 = 20.
11 + 6 = 17.
12 + 4 = 16.
10 + 5 = 15.
11 + 8 = 19.
10 + 4 =14.
14 + 3 = 17.
13 + 5 = 18.
Exercise 43
1.
Subtract.
15 – 3 =
14 – 4 =
19 – 6 =
18 – 6 =
17 – 4 =
16 – 6 =
16 – 3 =
19 – 5 =
Solution:
15 – 3 = 12.
14 – 4 = 10.
19 – 6 = 13.
18 – 6 = 12.
17 – 4 = 13.
16 – 6 = 10.
16 – 3 = 13.
19 – 5 = 14.
2.
Subtract.
13 – 1 =
16 – 5 =
17 – 5 =
20 – 3 =
19 – 7 =
15 – 4 =
18 – 5 =
19 – 4 =
Solution:
13 – 1 = 12.
16 – 5 = 11.
17 – 5 = 12.
20 – 3 = 17.
19 – 7 = 13.
15 – 4 = 11.
18 – 5 = 13.
19 – 4 = 15.
3.
Complete the subtraction sentences for each picture.
14 – 3 = 11.
17 – 3 = 14.
12 – 2 = 10.
17 – 7 = 10.
13 – 3 = 10.
14 – 2 = 12.
20 – 10 = 10.
16 – 4 = 14.
Exercise 44
1.
Subtract.
15 – 10 =
10 – 4 =
10 – 6 =
12 – 10 =
10 – 5 =
17 – 10 =
20 – 10 =
10 – 8 =
Solution:
15 – 10 = 5.
10 – 4 = 6.
10 – 6 = 4.
12 – 10 = 2.
10 – 5 = 5.
17 – 10 = 7.
20 – 10 = 10.
10 – 8 = 2.
2. Subtract.
12 – 6 =
11 – 6 =
13 – 5 =
11 – 9 =
12 – 8 =
15 – 7 =
14 – 8 =
16 – 9 =
Solution:
12 – 6 = 6.
11 – 6 = 5.
13 – 5 = 8.
11 – 9 = 2.
12 – 8 = 4.
15 – 7 = 8.
14 – 8 = 6.
16 – 9 = 7.
3. Subtract.
17 – 8 =
15 – 8 =
13 – 6 =
18 – 9 =
11 – 3 =
14 – 6 =
12 – 5 =
16 – 7 =
Solution:
17 – 8 = 9.
15 – 8 = 7.
13 – 6 = 7.
18 – 9 = 9.
11 – 3 = 8.
14 – 6 = 8.
12 – 5 = 7.
16 – 7 = 9.