Unit 1 Post Test Review

In the number 6,706, the digit 7 is in the thousands place, which means its value is 7,000. Therefore, the correct answer is 7,000.

To build the number 9,123 using Base Ten Blocks, you need to focus on the thousands place. The number 9,123 has 9 in the thousands place, so you will need 9 thousands blocks.

In the number 6,706, the digit 6 is in the thousands place. Therefore, to represent this digit, you would use a Thousands block, which corresponds to the value of 6,000.

Forty-three thousand, seventy-five is written as 43,075 in standard form. The other options do not match this number.

The expanded form of 654,514 is found by breaking it down into its place values: 600,000 (6 in the hundred-thousands), 50,000 (5 in the ten-thousands), 4,000 (4 in the thousands), 500 (5 in the hundreds), 10 (1 in the tens), and 4 (4 in the units). Thus, the correct choice is 600,000 + 50,000 + 4,000 + 500 + 10 + 4.

The number 2,351,126 can be broken down into its place values: 2,000,000 (2 million), 300,000 (3 hundred thousand), 50,000 (5 ten thousand), 1,000 (1 thousand), 100 (1 hundred), 20 (2 tens), and 6 (6 ones). Thus, the correct expanded form is 2,000,000 + 300,000 + 50,000 + 1,000 + 100 + 20 + 6.

The number 3,321,123 is broken down as follows: 3 million, 321 thousand, and 123. Therefore, the correct word form is 'Three million, three hundred twenty-one thousand, one hundred twenty-three'.

In the number 405,397, the digit 5 is in the thousands place, which represents 5,000. Therefore, the value of the 5 is 5,000.

In the number 5,907,397, the digit 5 is in the millions place, representing 5,000,000. Therefore, the value of the 5 is 5,000,000.