How to find the part from the whole
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SSAT Middle Level Quantitative › How to find the part from the whole
In March, there were 10 sunny days, 10 cloudy days, and 11 rainy days. How many days did it rain in March?
Explanation
Identify the number of rainy days in March:  days
Round  to the nearest tenth.
Explanation
When we round a number to the nearest tenth we look to the hundredths place to tell us if we round up or down.
If the number in our hundredths place is  or greater, we round up. If the number in the hundredths place is 
 or less, we round down. When we round up, the number in the hundredths place increases by 
 and all the other numbers to the right become 
. When we round down, the number in the hundredths place stays the same and all the other numbers to the right become 
.
In this case,  is greater than 
 so our rounded number is 
 or 
Round  to the nearest tenth.
Explanation
When we round a number to the nearest tenth we look to the hundredths place to tell us if we round up or down.
If the number in our hundredths place is  or greater, we round up. If the number in the hundredths place is 
 or less, we round down. When we round up, the number in the hundredths place increases by 
 and all the other numbers to the right become 
. When we round down, the number in the hundredths place stays the same and all the other numbers to the right become 
.
In this case,  is less than 
 so our rounded number is 
 or 
Round  to the nearest hundredth.
Explanation
When we round a number to the nearest hundredth we look to the thousandths place to tell us if we round up or down.
If the number in our thousandths place is  or greater, we round up. If the number in the thousandths place is 
 or less, we round down. When we round up, the number in the thousandths place increases by 
 and all the other numbers to the right become 
. When we round down, the number in the thousandths place stays the same and all the other numbers to the right become 
.
In this case,  is greater than 
 so our rounded number is 
 or 
Julie gets paid $304 a week for dogsitting. If she wants to buy a new washing machine that costs $1400, how many weeks does Julie need to work to save up the required amount? Round to the nearest whole week.
Explanation
Divide the cost of the washing machine by the amount of money she makes each week:
Answer: Julie needs to save for 5 weeks.
Round  to the nearest hundredth.
Explanation
When we round a number to the nearest hundredth we look to the thousandths place to tell us if we round up or down.
If the number in our thousandths place is  or greater, we round up. If the number in the thousandths place is 
 or less, we round down. When we round up, the number in the thousandths place increases by 
 and all the other numbers to the right become 
. When we round down, the number in the thousandths place stays the same and all the other numbers to the right become 
.
In this case,  is greater than 
 so our rounded number is 
 or 
Seventy people need to make five equal lines. How many people will be on each line?
Explanation
Divide:
 people per line
There are 15 animals in a pet store. The only animals are dogs and cats. There are twice as many dogs as cats. How many dogs are there?
Explanation
In this problem, the sum of the cats and dogs must equal 15. If there are 10 dogs, there must be 5 cats because there are twice as many dogs as cats. (Two times 5 is 10.)
Given that 10 plus 5 is 15, 10 is the correct answer.
Round  to the nearest hundredth.
Explanation
When we round a number to the nearest hundredth we look to the thousandths place to tell us if we round up or down.
If the number in our thousandths place is  or greater, we round up. If the number in the thousandths place is 
 or less, we round down. When we round up, the number in the thousandths place increases by 
 and all the other numbers to the right become 
. When we round down, the number in the thousandths place stays the same and all the other numbers to the right become 
.
In this case,  is greater than 
 so our rounded number is 
 or 
Round  to the nearest hundredth.
Explanation
When we round a number to the nearest hundredth we look to the thousandths place to tell us if we round up or down.
If the number in our thousandths place is  or greater, we round up. If the number in the thousandths place is 
 or less, we round down. When we round up, the number in the thousandths place increases by 
 and all the other numbers to the right become 
. When we round down, the number in the thousandths place stays the same and all the other numbers to the right become 
.
In this case,  is greater than 
 so our rounded number is 
 or