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Addition and Subtraction 8

This Math quiz is called 'Addition and Subtraction 8' and it has been written by teachers to help you if you are studying the subject at elementary school. Playing educational quizzes is an enjoyable way to learn if you are in the 3rd, 4th or 5th grade - aged 8 to 11.

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In this last elementary school Math quiz on addition and subtraction, you are going to get some practice in adding and subtracting decimals.

Follow these tips to help you:

1 .

23.5 - 14.9 + 146.2 = ?

145.8

154.8

154.7

154.6

23.5 - 14.9 + 146.2 = (100) + (20 + 40 - 10) + (3 + 6 - 4) + (0.5 + 0.2 - 0.9) = 100 + 50 + 5 - 0.2 = 154.8

2 .

2.3 + 5.6 + 12.3 = ?

19.1

20.1

20.2

20.3

Add the whole numbers first, then add the decimal parts. 2.3 + 5.6 + 12. 3 = (10) + (2 + 5 + 2) + (0.3 + 0.6 + 0.3) = 10 + 9 + 1.2 = 20.2

3 .

120.3 + 23.4 + 8.6 = ?

152.4

150.2

151.3

152.3

Add the whole numbers first, then add the decimal parts. 120.3 + 23.4 + 8.6 = (100) + (20 + 20) + (3 + 8) + (0.3 + 0.4 + 0.6) = 100 + 40 + 11 + 1.3 = 152.3

4 .

200 + 158.3 + 28.9 = ?

378.2

387.2

387.1

387.0

200 + 158.3 + 28.9 = (200 + 100) + (50 + 20) + (8 + 8) + (0.3 + 0.9) = 300 + 70 + 16 + 1.2 = 387.2

5 .

345.9 + 38.6 - 17.2 = ?

367.3

376.3

367.4

365.3

345.9 + 38.6 - 17.2 = (300) + (40 + 30 - 10) + (5 + 8 - 7) + (0.9 + 0.6 - 0.2) = 300 + 60 + 6 + 1.3 = 367.3

6 .

0.8 + 0.2 + 0.7 = ?

1.5

1.2

0.7

1.7

0.8 + 0.2 + 0.7 = (0.8 + 0.2) + 0.7 = 1 + 0.7 = 1.7. Be on the LOOKOUT for decimals that sum to 1

7 .

8.8 - 6.4 - 8.8 + 19.6 = ?

13.2

31.2

13.1

13.0

8.8 - 6.4 - 8.8 + 19.6 = (10) + (9 - 6) + (0.6 - 0.4) = 10 + 3 + 0.2 = 13.2: don't waste time writing numbers that cancel each other out, e.g. 8.8 - 8.8 = 0

8 .

128.7 + 450.3 - 15.2 + 200 = ?

763.9

763.7

763.8

763.6

128.7 + 450.3 - 15.2 + 200 = (100 + 400 + 200) + (20 + 50 - 10) + (8 - 5) + (0.7 + 0.3 - 0.2) = 700 + 60 + 3 + 0.8 = 763.8

9 .

69.9 - 40.6 + 123.4 = ?

152.8

152.6

152.7

152.5

69.9 - 40.6 + 123.4 = (100) + (60 + 20 - 40) + (9 + 3) + (0.9 + 0.4 - 0.6) = 100 + 40 + 12 + 0.7 = 152.7

10 .

678.1 - 345.2 = ?

332.8

332.7

323.9

332.9

678.1 - 345.2 = (600 - 300) + (70 - 40) + (8 - 5) + (0.1 - 0.2) = 300 + 30 + 3 - 0.1 = 333 - 0.1 = 332.9: Note: with negative numbers, the negative sign is kept with each part of the number, e.g. - 678.6 is written as -600, -70, -8, and -0.6

Author: Frank Evans (Specialist 11 Plus Teacher and Tutor)