What does that mean???
Sum
The answer to an addition expression
How many minutes in an hour?
60
Find the area of a rectangle with a width of 10in and a length of 6in.
Area= length x width, so because 10x6=60, the answer is 60 sq in (because the unit of area is the squares of an array).
15 minutes!
What does a denominator and numerator signify in the fraction 7/10.
Denominator is how many equal pieces the whole is cut into, which is 10.
Numerator is how many of those pieces we are addressing in the problem, which is 7 of the 10.
Product
The answer to a multiplication problem
How many tenths in a whole?
10
1,245-599
Because 599 is almost 600, leave 1,245 alone, then subtract 600. Then add one back on because you subtracted one too many.
1,245-600=645 *Base fact 12-6=6
Answer 646
4 x n = 77
4 x 10 = 40
4 x 8 = 32
4 x 1 = 4. So 77/4=19r1
Which fractions can be represented in a decimal:
4/10
2/4
12/100
2/9
4/10 .4
2/4 is half, which is .5
12/100 is .12
Only 2/9th cannot be a decimal!
Quotient
The answer to a division problem.
How many inches in a foot?
12
Find however many 3s get you as close to 86 without going over.
That is the maximum you could make, but there could be leftovers that are less than 3.
How many perpendicular lines?
There are 2 sets of parallel lines
There are 2 sets of perpendicular lines.
What is the lowest common denominator for:
5/8 7/10
Now make equivalents using the LCD and compare.
40!
5/8 can be cut into 25/40 using the knife strategy
7/10 is equivalent to 28/40. So 7/10 is greater.
Equivalent Fractions
A whole cut into different sized pictures that represent the same amount of the whole. (Like 1/2 and 6/12)
How many centimeters in a meter?
100
The perimeter of a rectangular yard is 46ft. The length is 15ft. What is the width?
I know 2 of the sides (15ft + 15ft), so I just need to make the other 2 sides (n + n) equal whatever is left.
19 x 49
931
What is greater, and why? .7 and .45
.7 is greater because .7 = .70 in hundredths
You can also see .7 is greater because if you round .45 down to .4, you can see it only has 4 tenths, instead of 7.
Lowest Common Denominator (for example, what is the lowest common denominator for 1/6 and 1/9)?
The smallest multiple that the numbers in both denominator positions share.
How many feet in a yard?
3
73 x 63
Box Method! Make space for both 2-digit numbers (it will have 4 squares).
6:15 plus an hour is 7:15
Plus 30 minutes is 7:45
Plus 20 minutes is 8:05
43,848. How many times greater is the 4 in the place value place on the left than the 4 on the right?
The left 4 = 40,000
The right 4 is 40.
40,000 is 1,000 times greater, because two spaces holders were needed to turn 40 into 40,000, and every jump is x10.