1.9 Proficiency exam

( [link] ) What is the largest digit?

( [link] ) In the Hindu-Arabic number system, each period has three values as­signed to it. These values are the same for each period. From right to left, what are they?

( [link] ) In the number 42,826, how many hundreds are there?

( [link] ) Is there a largest whole number? If so, what is it?

( [link] ) Graph the following whole numbers on the number line: 2, 3, 5.

( [link] ) Write the number 63,425 as you would read it aloud.

( [link] ) Write the number eighteen million, three hundred fifty-nine thousand, seventy-two.

( [link] ) Round 427 to the nearest hundred.

( [link] ) Round 18,995 to the nearest ten.

( [link] ) Round to the most reasonable digit: During a semester, a mathematics instructor uses 487 pieces of chalk.

( [link] ) $\begin{array}{c}\hfill 627\\ \hfill \underline{+\mathrm{ 48}}\end{array}$

( [link] ) $\text{3106}+\text{921}$

( [link] ) $\begin{array}{c}\hfill 152\\ \hfill \underline{+\mathrm{ 36}}\end{array}$

( [link] ) $\begin{array}{c}\hfill \mathrm{5,189}\\ \hfill \mathrm{6,189}\\ \hfill \mathrm{4,122}\\ \hfill \underline{+\mathrm{8,001}}\end{array}$

( [link] ) $\text{21}+\text{16}+\text{42}+\text{11}$

( [link] ) $\text{520}-\text{216}$

( [link] ) $\begin{array}{c}\hfill \mathrm{80,001}\\ \hfill \underline{-\mathrm{ 9,878}}\end{array}$

( [link] ) Subtract 425 from 816.

( [link] ) Subtract 712 from the sum of 507 and 387.

( [link] ) Is the sum of 219 and 412 the same as the sum of 412 and 219? If so, what makes it so?