Problem
Put the three biggest cards in the hundreds, tens, ones places: 9, then 8, then 5.
Bigger digits in higher place values make a bigger number - basic place-value sense.
4.NBT.B.4Make A Systematic ListTurning the digits of 985 each 180 degrees: 9 becomes 6, 8 becomes 8, 5 becomes 2.
A half-turn changes each digit into the shape it looks like when read upside down.
4.G.A.3Draw A DiagramThe whole number turns at once, so the order also reverses: 6, 8, 2 read backward is 2, 8, 6 = 286.
Spinning a strip of digits halfway around flips left-right as well as turning each symbol.
4.G.A.3Draw A DiagramTurning the whole three-digit block 985 a half turn makes its digits come out in reversed left-to-right order, so the turned digits 6, 8, 2 are read as 286.
The three digits are spun together as one rigid block, so afterward they are still three same-size digits standing in a straight row, only turned to face the other way.
A turn lays the figure exactly onto its turned copy, point for point, so every length and angle stays equal and no digit is stretched or bent.
Turning that row a half turn carries the far-left digit over to the far right and the far-right digit over to the far left, so the digits end up read in the opposite order.
A half turn is a turn through 180 degrees, which is a straight angle, and a straight angle faces the exact opposite direction, so leftward is carried to rightward.
Find the difference between the original number and the rotated number.
Straightforward multi-digit subtraction once both numbers are known.
4.NBT.B.4Make A Systematic ListPut the biggest digits first to make 985, then turn it upside-down (digits change AND flip order) to get 286 - easy Grade 4 place-value and subtraction!