Children can begin to master 4-digit subtraction problems with these leveled Montessori Subtraction Cards. This set includes 4 levels, with each level containing 15 cards, and each card is made up of 4 problems. Every problem has 4-digit color coded numerals to coincide with the Montessori math colors, for familiarity and repetitive reinforcement of place value.
Each level is broken down into the following categories:
No B ~ Static addition problems only. (No Borrowing)
B1 ~ Every p