Model subtraction as both "take away" and "find the difference". For 4 000 − 1 640, think aloud using counting-on from 1 640 to 4 000, and show the inverse check (1 640 + 2 360 = 4 000).
Together 1. 820 − 350 by counting on.
Together 2. 3 000 − 1 250, then check by adding back.
Students complete "Sharing from the Pile: Subtraction". Encourage an inverse-addition check on at least two answers.