- Sarah had 80 cupcakes to sell at a bake sale. She sold 70 cupcakes. Then Sarah’s mom brought 20 more cupcakes for Sarah to sell at the bake sale. Which expression can be used to find out how many cupcakes, \(c\), Sarah now has?
- \(80-70+20=c\)
- \(80+70-20=c\)
- \(80-70-20=c\)
- \(80+70+20=c\)
Sarah started with 80 cupcakes, and she sold 70, so the expression \(80-70\) can be used to represent the number of cupcakes she had before her mom brought more to sell. Because her mom brought 20 more cupcakes to the bake sale, 20 is added to the previous expression.
The equation which represents the number of cupcakes Sarah has after selling 70 cupcakes and receiving 20 more is \(80-70+20=c\).
- Last week, Lucas had 55 marbles. He lost some marbles when he dropped his marble bag outside. Now Lucas has 32 marbles. Which equation can be used to show the amount of marbles, \(m\), that Lucas lost?
- \(55-m=32\)
- \(m-55=32\)
- \(m-32=55\)
- \(m+32=55\)
Lucas began with 55 marbles, so the expression should begin with 55 marbles. Because he lost \(m\) marbles, \(m\) should be subtracted from the 55. So the expression \(55-m\) can be used to show how many marbles Luca has now.
The problem states that he now has 32 marbles, so the \(55-m\) is equal to 32. Therefore, the equation which represents this scenario is \(55-m=32\).
- What is the sum of 7 and 6?
- 11
- 12
- 13
- 14
If seven items and six items were placed side-by-side and all of the items were counted, there would be 13 items.
- What is the sum of 9 and 5?
- 11
- 12
- 13
- 14
If nine items and five items were placed side-by-side and all of the items were counted, there would be 14 items.
- Which pair of equal numbers add to 16?
- 7 and 7
- 8 and 8
- 9 and 9
- 10 and 10
Let’s take a look at what each pair of numbers adds to:
- \(7+7=14\)
- \(8+8=16\)
- \(9+9=18\)
- \(10+10=20\)
Only 8 and 8 add up to 16 from this group of numbers.
- Which equation can be used to determine the number of squares in the image below?
- \(4+4+4+4=16\)
- \(5+5+5+5=20\)
- \(6+6+6+6=24\)
- \(7+7+7+7=28\)
Because there are five columns and four rows, 5 is added four times to find the number of squares. The resulting equation is \(5+5+5+5=20\).
- Eight hundreds, five tens, and three ones is equivalent to which number?
- 853
- 835
- 583
- 538
An 8 in the hundreds spot means it is the third digit from the right. A 5 in the tens spot means it is the second digit from the right, and a 3 in the ones spot means it is the digit on the far right. The final answer is 853.
- Ten 10s is the same as which number?
- 1
- 10
- 1,000
- 100
Because 10 is a 1 with a 0 behind it, ten 10s is a 10 with a 0 behind it, which is 100.
- Take a look at the numbers below. Are the numbers progressing by fives, tens, hundreds, or thousands?
- Fives
- Tens
- Hundreds
- Thousands
The difference between each consecutive number is 5, so the numbers are progressing by fives.
- How is the number 645 read in expanded form?
- Six hundred fifty-four
- Six hundred forty-five
- Six thousand forty-five
- Six thousand four hundred fifty
A 6 in the third digit from the right is six hundred. The 4 in the tens spot is forty, and a 5 in the ones spot is five. The final answer is six hundred forty-five.