More Mental Addition and Subtraction (3-digit numbers)
We practice adding a single-digit number to a 3-digit number and also subtracting a single-digit number from a 3-digit number, using mental math (I show various strategies). Along the way we also look at which expression or number sentence matches a word problem, make a number pattern, and in the end, solve missing number "puzzles".
If you cannot see the video above, click here for an alternative video player.
See also
Regrouping twice in subtraction
Math Mammoth Grade 3 curriculum