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Questions in Grade Middle-school

[Answered] What is the relationship between bridge strength and bridge length?

[Answered] There are 3 cans that store a total of 9 tennis balls. Consider the number of balls per can.

[Answered] A navy submarine descended from sea level at a rate of 7 feet per second. Write the descent rate and the submarine's elevation after 10 minutes.

[Answered] Frances has no money in her checking account. She writes 3 checks for $35 each. The bank imposes a $15 penalty because she has overdrawn her account. How much money is in her account now?

[Answered] Estimate: 1,374 x 6

[Answered] 800 is 10 times as much as what number?

[Answered] A hot air balloon leaves the ground and ascends at a rate of 6 feet per second for 3 minutes. Then it descends at a rate of 3 feet per second for 2 minutes. Finally, it ascends at a rate of 4 feet per second for 5 minutes. How far above the ground is the balloon now?

[Answered] What is 628 times 33? Show your work. --- \[ \begin{aligned} & \quad\ \ \ 628 \\ & \times \ \ 33 \\ \hline & \quad\ \ 1884 \quad\ (\text{628} \times \text{3}) \\ &+ 18840 \quad\ (\text{628} \times \text{30}) \\ \hline & \ \ 20724 \end{aligned} \] Therefore, \( 628 \times 33 = 20724 \).

[Answered] Use the clue to find the mystery number. 1. The mystery number has 5 digits. 2. The mystery number contains the digits 2, 3, and 4. Digits may be used more than once in the mystery number. 3. The value of the digit in the hundreds place is 200. 4. The largest digit is in the ten thousands place. 5. The digit in the hundreds place has a value ten times the value of the digit in the tens place. 6. The sum of the digit in the hundreds place and the digit in the thousands place is 5. 7. The digit in the ones place is double the digit next to it. What is the mystery number?

[Answered] What is the value of the digit 4 in the number 440?