Now the numbers grow into the hundreds, and third graders learn to peek at the tens digit instead. Part A clears up three mixed-up sentences about 420, 783, and the always-tricky 250. Part B has them round 310, 567, 892, and 135 to the nearest hundred. Part C wraps up with true-or-false statements that test whether they remember which digit to inspect, plus checks on 620 and 850.

Separating hundreds rounding from tens rounding here helps prevent the digit-confusion that trips up many third graders later.