Rounding 670 to the nearest ten means determining which multiple of ten is closest to 670. In this case, 670 is closer to 670 than to 680, so it rounds down to 670. Rounding to the nearest hundred would result in 700, as 670 is closer to 700 than to 600.
1000
23% of 670 = 23% * 670 = 0.23 * 670 = 154.1
670
The number 670 can be expressed as the sum of various combinations of integers. For example, 670 is equal to 335 + 335, 200 + 300 + 170, or 670 + 0, among many other possibilities. Additionally, 670 is a multiple of 10, so it can also be expressed as 67 * 10.
That would depend on what you were rounding it to. If rounding to the nearest whole number, then it does not need rounding. If rounding to the nearest ten, it would be 420. If rounding to the nearest hundred, it would be 400.
You can calculate 3444 times 670 without rounding or you can estimate it WITH rounding. But you cannot estimate it without rounding.
700
1000
670
80% of 670 = 80% * 670 = 0.8 * 670 = 536
23% of 670 = 23% * 670 = 0.23 * 670 = 154.1
10
670 meters equals 670 meters.
670.
0.0134
670
670 is ten times bigger than 67.