# 180 Days of Math for Fourth Grade Day 50 Answers Key

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## 180 Days of Math for Fourth Grade Answers Key Day 50

Directions Solve each problem.

Question 1.

Explanation:
Subtract the values which are in one’s place
Put the 9 in one’s place and carry 18 to the carry row
The difference of 28 and 9 is 19.

Question 2.
9 × 6 = _____
9 x 6 = 54
Explanation:
The product of 9 and 6 is 54.
we have to multiply 9 with 6.

Question 3.
How many twos are in 18?
______________
18 ÷ 2 = 9
Explanation:
To know how many twos are in 18 we have to divide 18 by 2
There are 9 twos in 18.

Question 4.
List all the factors of 24.
______________
Factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24.
Explanation:
Factors are nothing but multiples of  24
The combination of factors gives the product as 24 are called factors
a number or algebraic expression that divides another number or expression evenly—i.e., with no remainder is called a factor.

Question 5.
What is the number after 3,899?
______________
3900
Explanation:
The 3,899 (three thousand eight hundred ninety-nine) is an odd four-digits composite number
following 3898 and preceding 3900.

Question 6.
24 ÷ = 4
24 ÷ 6 = 4
Explanation:
The division and multiplication are inversely proportional operations
6 x 4 = 24

Question 7.
How many mm are in 2 cm?
______________
2 cm = 20 mm
Explanation:
1 cm = 10 mm
2 x 10 = 20
1 centimeter is equal to 10 millimeters

Question 8.
____ quarts = $$\frac{1}{2}$$ gallon
2 quarts = $$\frac{1}{2}$$ gallon
Explanation:
1 gallon = 4 quarts
so, half of the gallon = 2 quarts.

Question 9.
Circle the right angles.

Explanation:
a right angle is an angle of exactly 90 degrees
Figure A and C shows 90 degrees

Question 10.
$$\frac{1}{5}$$ of 45 is 9, so $$\frac{4}{5}$$ of 45 is
_____________________
$$\frac{4}{5}$$ of 45 is 36
$$\frac{1}{5}$$ of 45 is 9,
$$\frac{4}{5}$$ of 45 is 36