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See if you can do these tricky addition and subtraction problems.
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.
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
3.
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
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.
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
6.
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
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.
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
9.
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
10.
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
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🔓 Unlock UNLIMITED Quizzes and challenge yourself every day. But that's not all...
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Don't miss out! Join us now and keep the fun rolling. 🎉
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