1.9: Proficiency Exam
Exercise \(\PageIndex{1}\)
What is the largest digit?
- Answer
-
9
Exercise \(\PageIndex{2}\)
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?
- Answer
-
ones, tens, hundreds
Exercise \(\PageIndex{3}\)
In the number 42,826, how many hundreds are there?
- Answer
-
8
Exercise \(\PageIndex{4}\)
Is there a largest whole number? If so, what is it?
- Answer
-
no
Exercise \(\PageIndex{5}\)
Graph the following whole numbers on the number line: 2, 3, 5.
- Answer
-
Exercise \(\PageIndex{6}\)
Write the number 63,425 as you would read it aloud.
- Answer
-
Sixty-three thousand, four hundred twenty-five
Exercise \(\PageIndex{7}\)
Write the number eighteen million, three hundred fifty-nine thousand, seventy-two.
- Answer
-
18,359,072
Exercise \(\PageIndex{8}\)
Round 427 to the nearest hundred.
- Answer
-
400
Exercise \(\PageIndex{9}\)
Round 18,995 to the nearest ten.
- Answer
-
19,000
Exercise \(\PageIndex{10}\)
Round to the most reasonable digit: During a semester, a mathematics instructor uses 487 pieces of chalk.
- Answer
-
500
For problems 11-17, find the sums and differences.
Exercise \(\PageIndex{11}\)
\(\begin{array} {r} {627} \\ {\underline{+\ \ 48}} \end{array}\)
- Answer
-
675
Exercise \(\PageIndex{12}\)
3106 + 921
- Answer
-
4,027
Exercise \(\PageIndex{13}\)
\(\begin{array} {r} {152} \\ {\underline{+\ \ 36}} \end{array}\)
- Answer
-
188
Exercise \(\PageIndex{14}\)
\(\begin{array} {r} {5,189} \\ {6,189} \\ {4,122} \\ {\underline{+8,001}} \end{array}\)
- Answer
-
23,501
Exercise \(\PageIndex{15}\)
21 + 16 + 42 + 11
- Answer
-
90
Exercise \(\PageIndex{16}\)
520 - 216
- Answer
-
304
Exercise \(\PageIndex{17}\)
\(\begin{array} {r} {80,001} \\ {\underline{-\ \ 9,878}} \end{array}\)
- Answer
-
70,123
Exercise \(\PageIndex{18}\)
Subtract 425 from 816.
- Answer
-
391
Exercise \(\PageIndex{19}\)
Subtract 712 from the sum of 507 and 387.
- Answer
-
182
Exercise \(\PageIndex{20}\)
Is the sum of 219 and 412 the same as the sum of 412 and 219? If so, what makes it so?
- Answer
-
Yes, commutative property of addition