Decimal Operations Quiz

Grade 4 · Math · Quiz

Practice adding, subtracting, comparing, and understanding decimals to the hundredths place.

Questions

1. What is 5.6 + 3.27?

   1. 8.33
   2. 8.77
   3. 8.87
   4. 9.87
   Show answer

   Answer: 8.87

   5.6 + 3.27: write as 5.60 + 3.27. Hundredths: 0 + 7 = 7. Tenths: 6 + 2 = 8. Ones: 5 + 3 = 8. Answer: 8.87.

2. What is 7.4 − 2.65?

   1. 4.65
   2. 4.75
   3. 5.25
   4. 5.35
   Show answer

   Answer: 4.75

   7.4 − 2.65: write as 7.40 − 2.65. Hundredths: 0 − 5, borrow → 10 − 5 = 5. Tenths: 3 − 6, borrow → 13 − 6 = 7 wait — 3 after borrow: 3 − 1 = 2, then 12 − 6 = 6. Ones: 6 − 2 = 4. Wait, let me recalculate: 7.40 − 2.65. Hundredths: 0 < 5, borrow from tenths: 10 − 5 = 5, tenths becomes 3. Tenths: 3 < 6, borrow from ones: 13 − 6 = 7, ones becomes 6. Ones: 6 − 2 = 4. Result: 4.75.

3. Which decimal is the greatest?

   1. 0.09
   2. 0.9
   3. 0.90
   4. 0.099
   Show answer

   Answer: 0.9

   0.9 = 0.900 = 900 thousandths. 0.09 = 90 thousandths. 0.90 = 900 thousandths (same as 0.9). 0.099 = 99 thousandths. 0.9 and 0.90 are equal and the greatest.

4. 0.30 written as a fraction in lowest terms is _____.

   Show answer

   Answer: 3/10

   0.30 = 30/100. Simplify by dividing both by 10: 30/100 = 3/10.

5. Sara has $5.80 and spends $2.45. How much does she have left?

   1. $2.35
   2. $3.25
   3. $3.35
   4. $3.45
   Show answer

   Answer: $3.35

   $5.80 − $2.45: Cents: 80 − 45 = 35. Dollars: 5 − 2 = 3. Answer: $3.35.

6. 0.70 is the same value as 0.7.

   Show answer

   Answer: True

   Adding a trailing zero to a decimal does not change its value. 0.70 = 0.7 = 7 tenths.

7. Which number has a 4 in the hundredths place?

   1. 4.21
   2. 2.41
   3. 2.14
   4. 41.2
   Show answer

   Answer: 2.14

   In 2.14: the 1 is in the tenths place and the 4 is in the hundredths place.

8. A piece of ribbon is 3.6 m long. Another piece is 1.45 m long. How long are they together?

   1. 4.65 m
   2. 5.05 m
   3. 5.15 m
   4. 5.50 m
   Show answer

   Answer: 5.05 m

   3.6 + 1.45: write as 3.60 + 1.45. Hundredths: 0 + 5 = 5. Tenths: 6 + 4 = 10, write 0 carry 1. Ones: 3 + 1 + 1 = 5. Answer: 5.05 m.

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