Equivalent Equations
True or False
30 x 9 = 9 x (3 + 10)
False
30 x 9 = 9 x (3 + 10)
270 = 9x13
270 = 117
Michelle saved 4 times as much money as her brother, Sam. He saved $40. How much money did Michelle save?
4 x 40 = 160
12 x 16 =
192
Ricky says there are 7 tens in 370. Hunter says there are 37 tens in 370. Their teacher says they are both right. How can that be? Explain.
There is a 7 in the TENS place value, there is also a total of 37 TENS in the whole number.
True or False
16 x 18 = (16 x 10) + (16 x 8)
True
16 x 18 = (16 x 10) + (16 x 8)
Kendra earns money washing windows. She makes 25 cents for each window she washes. If she washes 9 windows, how much money does she make?
25 x 9 =
20 x 9 = 180
5 x 9 = 45
180 + 45 = 225
100 x ____ = 400
4
Fill in the blanks in the ratio table.
1 - 8
2 - __
__ - 32
__ - 80
20 - __
1 - 8
2 - 16
4 - 32
10 - 80
20 - 160
True or False
3 x 300 = (3 x 3) x 100
True
3 x 300 = (3 x 3) x 100
$25 / 2 = 12 R 1 = $12.50 each
50 x ____ = 250
5
Which of these numbers is prime?
17
21
27
34
17
True or False
21 / 2 = 11 R 1
False
2 x 10 = 20 + R1
Carter also washes windows. He charges 10 cents for small windows and 25 cents for large windows. I
If Carter washes 13 small windows and 18 big windows, how much money does he make?
(13 x 10) + (18 x 25) =
130 + 450 =
580 = $5.80
20 x 6 = ____
120
Fill in the blank.
(29 x 30) = (20 x 30) + (____ x 30)
9
Fill in the blank.
15 x 10 = (___ x 10) + (5 x 10)
10
Spencer has 270 marbles. Jake said, "Spencer has 3 times as many marbles as I do!" Which equation could represent this situation. (j stands for Jake's marbles)
270 x 3 = j
3 x 270 - j
3 x j = 270
270 x j = 3
3 x j = 270
30 x ____ = 120
4
Sara was cleaning her room. She found 17 tiny toy cars and decided to give them to her 2 brothers.
Sara divided the 17 tiny cars evenly between the 2 boys. Which equation shows how things worked out?
17 / 2 = 8 R1
17 / 2 = $8.50
17 / 2 = 8 1/2
Explain your choice. Why did you choose that equation?
17 / 2 = 8R1
I chose this equation because there could be one car left over, the problem isn't talking about money and you can't cut a car in half.