Question

list the factors of 20.
find the difference.
$\begin{array}{r}366,825\\- 236,657\hlineend{array}$
find the sum.
$\begin{array}{r}527,381\\+ 364,098\hlineend{array}$
how long will it take you to drive 135 miles at a speed of 45 miles per hour?
what is the lcm of 3 and 8?
find the product.
$\begin{array}{r}5,384\\times 65\hlineend{array}$
what number belongs in the empty pentagon?
(5, 10, 20, 40, empty pentagon)
a boutique sold $127.50 worth of purses. how many purses did they sell?
(image of a purse with $7.50 tag)
khan academy:

Explanation:

1. List the factors of 20.

Step1: Recall factor definition

A factor of a number is an integer that divides the number without leaving a remainder.

Step2: Find factors of 20

Start with 1: \(20\div1 = 20\), so 1 and 20 are factors.
\(20\div2 = 10\), so 2 and 10 are factors.
\(20\div4 = 5\), so 4 and 5 are factors.

Step1: Subtract digit by digit (right to left)

Start with the units place: \(5 - 7\), can't do, borrow 1 from tens place. Tens place: \(2\) becomes \(1\), units place: \(15 - 7 = 8\).
Tens place: \(1 - 5\), borrow 1 from hundreds place. Hundreds place: \(8\) becomes \(7\), tens place: \(11 - 5 = 6\).
Hundreds place: \(7 - 6 = 1\).
Thousands place: \(6 - 6 = 0\).
Ten - thousands place: \(6 - 3 = 3\).
Hundred - thousands place: \(3 - 2 = 1\).

Step2: Calculate the result

\(366825 - 236657 = 130168\)

Step1: Add digit by digit (right to left)

Units place: \(1 + 8 = 9\).
Tens place: \(8 + 9 = 17\), carry over 1, write 7.
Hundreds place: \(3 + 0 + 1 = 4\).
Thousands place: \(7 + 4 = 11\), carry over 1, write 1.
Ten - thousands place: \(2 + 6 + 1 = 9\).
Hundred - thousands place: \(5 + 3 = 8\).

Step2: Calculate the result

\(527381 + 364098 = 891479\)

Answer:

1, 2, 4, 5, 10, 20

2. Find the difference: \(

$$\begin{align} 366,825 \\ - 236,657 \\ \hline \end{align}$$

\)