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

**Directions Solve each problem.**

Question 1.

Answer:

Explanation:

Subtract the values which are in oneâ€™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 Ã— 6 = _____

Answer:

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?

______________

Answer:

18 **Ã· **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.

______________

Answer:

Factors of 24 areÂ 1, 2, 3, 4, 6, 8, 12 and 24.

Explanation:

Factors are nothing but multiples ofÂ 24

The combination of factors gives the product as 24 are called factors

a number or algebraic expression that divides another number or expression evenlyâ€”i.e., with no remainder is called a factor.

Question 5.

What is the number after 3,899?

______________

Answer:

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 Ã· = 4

Answer:

24 Ã· 6 = 4

Explanation:

The division and multiplication are inversely proportional operations

6 x 4 = 24

Question 7.

How many mm are in 2 cm?

______________

Answer:

2 cm = 20 mm

Explanation:

1 cm = 10 mm

2 x 10 = 20

1Â centimeterÂ is equal to 10Â millimeters

Question 8.

____ quarts = \(\frac{1}{2}\) gallon

Answer:

2 quarts = \(\frac{1}{2}\) gallon

Explanation:

1 gallon = 4 quarts

so, half of the gallon = 2 quarts.

Question 9.

Circle the right angles.

Answer:

Explanation:

a right angle isÂ 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

_____________________

Answer:

\(\frac{4}{5}\) of 45 is 36

Explanation:

\(\frac{1}{5}\) of 45 is 9,

so 4 x 9 = 36

\(\frac{4}{5}\) of 45 is 36