Multiple Choice

1. How should the multiplication problem $3 \times 0.2$ be correctly written as a repeated addition sentence?

   $3 + 3 + 3$

   $0.2 + 0.3$

   $3 + 0.2$

   $0.2 + 0.2 + 0.2$

2. What is the product of the repeated addition $0.05 + 0.05 + 0.05 + 0.05$?

   $0.15$

   $0.020$

   $0.20$

   $2.0$

3. A builder orders 6 packets of nails. Each packet weighs $0.4$ kilograms. Which multiplication equation correctly represents the total weight found by repeated addition?

   $4 \times 0.6$

   $6 + 0.4$

   $0.4 \times 0.6$

   $6 \times 0.4$

4. The repeated addition $0.15 + 0.15 + 0.15 + 0.15$ is equivalent to the multiplication expression $N \times 0.15$. What number does $N$ represent?

   $4$

   $0.15$

   $0.60$

   $3$

5. If you walk $0.7$ miles every day for 5 days, which repeated addition problem shows the total distance walked?

   $0.7 + 0.7 + 0.7 + 0.7 + 0.7$

   $5 + 5 + 5 + 5 + 5 + 5 + 5$

   $5 + 0.7 + 0.7 + 0.7 + 0.7$

   $0.7 + 0.7 + 0.7 + 0.7$

6. If you buy 8 chocolate bars, and each bar costs $\$0.25$, what is the total cost calculated by the multiplication $8 \times \$0.25$?

   $\$0.25$

   $\$2.00$

   $\$1.50$

   $\$8.25$

7. Which repeated addition problem shows the meaning of the multiplication $2 \times 0.09$?

   $0.09 + 0.09$

   $2 + 2 + 0.09$

   $0.09 + 2$

   $0.09 + 0.20$

8. A recipe requires $0.1$ cup of sugar for one batch. If a baker makes 12 batches, the total sugar needed is found by adding $0.1$ cup twelve times. What is the total amount of sugar needed?

   $1.0$ cups

   $0.12$ cups

   $1.20$ cups

   $1.2$ cups

9. When you multiply $4.5$ by $10$, how many places does the decimal point move to the right? What is the new product?

   $0.45$

   $4.05$

   $45$

   $450$

10. If you have the number $0.72$ and multiply it by $10$, what is the result?

    $0.072$

    $7.2$

    $72$

    $72.0$

11. Multiplying any decimal number by $10$ causes the value of each digit to increase to the next highest place value. How does this rule change the position of the decimal point?

    It moves one place to the left.

    It moves one place to the right.

    It moves two places to the left.

    It moves two places to the right.

12. Calculate the product of $3.1$ and $100$.

    $3.100$

    $31$

    $3,100$

    $310$

13. What is $0.6$ multiplied by $100$?

    $0.06$

    $600$

    $60$

    $6$

14. A box weighs $1.45$ pounds. If you have $100$ identical boxes, what is the total weight in pounds?

    $14.5$

    $1.45$

    $1,450$

    $145$

15. Which calculation below is incorrect based on the place value rules for multiplying decimals by powers of ten?

    $9.8 \times 10 = 98$

    $0.5 \times 10 = 5$

    $1.15 \times 10 = 11.5$

    $72 \times 10 = 7.2$

16. If the starting number $5.2$ is multiplied by a factor to result in the product $520$, what was the factor?

    $100$

    $1,000$

    $1$

    $10$

17. A recipe calls for $0.25$ liters of water. If the chef wants to make $100$ times the recipe, how many liters of water are needed?

    $2500$

    $25$

    $2.5$

    $250$

18. When you multiply $6.3$ by $100$, you shift the decimal point two places right. In the final answer of $630$, what place value does the digit $3$ now hold?

    Hundredths place

    Tens place

    Hundreds place

    Ones place

19. What is the product of $0.2$ and $3$?

    $0.5$

    $6$

    $0.06$

    $0.6$

20. Calculate the value of $4$ multiplied by $0.7$.

    $28$

    $0.28$

    $2.8$

    $1.1$

21. Five friends each bring $\$0.5$ for a shared snack. How much money do they have in total?

    $25$

    $0.25$

    $2.5$

    $1.0$

22. Multiply $0.3$ by $8$.

    $2.4$

    $0.24$

    $24$

    $1.1$

23. A measuring cup holds $0.9$ liters of water. If you fill it $6$ times, how many liters of water do you have?

    $1.5$

    $5.4$

    $54$

    $0.54$

24. What is $0.8$ doubled?

    $0.16$

    $16$

    $1.6$

    $1.0$

25. Calculate $5$ groups of $0.4$.

    $0.45$

    $20$

    $2.0$

    $0.20$

26. Find the product of $0.9$ and $9$.

    $8.1$

    $0.81$

    $1.8$

    $81$

27. A recipe requires $0.6$ cups of flour. If you make the recipe $7$ times, how many cups of flour do you use?

    $1.3$

    $4.2$

    $42$

    $0.42$

28. What is $0.1$ multiplied by $9$?

    $0.09$

    $1.0$

    $9$

    $0.9$

29. What is the product of $0.12$ and $4$?

    $0.48$

    $4.8$

    $48$

    $0.048$

30. Calculate the result of $0.35 \times 5$ using the standard multiplication algorithm.

    $1.75$

    $1.85$

    $1.65$

    $17.5$

31. If you multiply $0.62$ by $7$, what is the final answer?

    $4.24$

    $4.44$

    $4.34$

    $43.4$

32. What is the value of $0.09 \times 8$?

    $7.2$

    $0.8$

    $72$

    $0.72$

33. A builder uses $0.84$ pounds of nails for each birdhouse. If he builds 6 birdhouses, how many pounds of nails does he use?

    $5.04$

    $5.4$

    $50.4$

    $4.94$

34. Use the standard algorithm to solve $0.28 \times 9$.

    $2.52$

    $2.62$

    $25.2$

    $1.62$

35. Find the product: $0.45 \times 2$.

    $0.80$

    $9.0$

    $1.00$

    $0.90$

36. Each piece of candy costs $\$0.75$. If Sarah buys 3 pieces, what is the total cost?

    $\$22.50$

    $\$2.15$

    $\$2.25$

    $\$2.35$

37. Calculate $0.91 \times 5$.

    $4.05$

    $4.55$

    $5.55$

    $45.5$

38. When you multiply $0.18$ by $2$, what result do you get?

    $0.36$

    $0.26$

    $1.36$

    $3.6$

39. To find the product of $2.5 \times 3$, you first calculate $25 \times 3 = 75$. How many digits must be after the decimal point in the final answer?

    Zero, because $3$ is a whole number.

    Three, because it is a large number.

    One, because $2.5$ has one digit after the decimal point.

    Two, because you are multiplying.

40. When calculating $0.4 \times 0.2$, you multiply $4 \times 2$ to get $8$. Since the factors have a total of two decimal places ($0.4$ has one and $0.2$ has one), what is the correct product?

    $0.08$

    $0.8$

    $80$

    $8.0$

41. When you multiply the number $1.34$ by $10$, where should the decimal point be placed in the final answer?

    It moves two places to the right.

    It moves one place to the left.

    It moves one place to the right.

    It stays in the same place.

42. A math rule states that the number of decimal places in the product is the sum of the decimal places in the factors. If Factor 1 is $3.15$ (2 places) and Factor 2 is $2.4$ (1 place), how many decimal places will the product have?

    One

    Four

    Two

    Three

43. The factors $1.1$ and $4.1$ have a total of two decimal places. If the digits of the product (calculated without decimals) are $451$, which is the correct final answer?

    $45.1$

    $0.451$

    $451.0$

    $4.51$

44. Look at the product of $0.05 \times 6$. Since $0.05$ has two decimal places, the product must also have two decimal places. If $5 \times 6 = 30$, what is the correct answer?

    $0.30$

    $0.030$

    $3.0$

    $30.0$

45. A student calculated $5 \times 0.12$ and got $6.0$. Why is this product likely incorrect based only on the decimal point placement rule?

    Multiplying by $5$ should move the decimal point to the left.

    The product should have zero decimal places because $5$ is a whole number.

    The product should be $0.06$.

    The product must have two decimal places, not one.

46. What happens to the decimal point when you multiply $25.0$ by $0.1$?

    The answer stays $25.0$.

    The decimal point moves two places to the left.

    The decimal point moves one place to the left.

    The decimal point moves one place to the right.

47. Calculate the product of $0.5 \times 3$. Remember that the answer must have one decimal place since $0.5$ has one decimal place.

    $1.5$

    $5.3$

    $0.15$

    $15.0$

48. Based on the rules of decimal placement, which multiplication problem will have exactly two digits after the decimal point in the final product?

    $3.5 \times 4.1$

    $4 \times 6.1$

    $10 \times 5.2$

    $0.1 \times 0.01$

49. If you multiply the decimal $1.2$ by the whole number $3$, how will the result compare to the original decimal $1.2$?

    The result will be larger than $1.2$.

    The result will be smaller than $1.2$.

    The result will be half of $1.2$.

    The result will be equal to $1.2$.

50. Ava multiplied the number $8.0$ by $0.9$. Without calculating the answer, why do we know the product will be less than $8.0$?

    Because $0.9$ is close to $1$.

    Because $8.0$ is being multiplied by a number between $0$ and $1$.

    Because $8.0$ is an even number.

    Because $8.0$ is being multiplied by a number greater than $1$.

51. If you want to make the number $4.6$ $ larger by multiplying it, which number should you choose as the multiplier?

    $1$

    $0.99$

    $1.01 $

    $0.1$

52. Which one of these multiplication problems will definitely result in a number smaller than the starting decimal $10.0$?

    $10.0$ times $0.5$

    $10.0$ times $1.5$

    10.0 times 1

    10.0 times 2

53. When multiplying the decimal $6.5$ by a factor, the result will only be smaller than the original decimal $6.5$ if the multiplier is...

    a number greater than $1$.

    greater than $6.5$.

    a number between $0$ and $1$.

    equal to $1$.