✓Covers the objective you searched
Crack the code with 4-digit column addition and subtraction

Included with membership→✓Covers the objective you searched
Add numbers with up to 4 digits using the formal written methods of columnar addition where appropriate

Free download→✓Covers the objective you searched
Subtract numbers with up to 4 digits using the formal written methods of columnar addition where appropriate

Free download→✓Covers the objective you searched
Add up to 4 -digits using formal methods

Free download→✓Covers the objective you searched
Add and subtract numbers with up to 4-digits

Free download→✓Covers the objective you searched
Add and subtract up to 4 -digits using formal methods

Free download→✓Covers the objective you searched
Add and subtract numbers with up to 4 digits using the formal written methods

Free download→✓Covers the objective you searched
L1 4-Digit Column Addition, no exchanges

Included with membership→✓Covers the objective you searched
L2 4-Digit Column Addition, with exchanges

Included with membership→✓Covers the objective you searched
L3 4-Digit Column Subtraction, no exchanges

Included with membership→✓Covers the objective you searched
L4 4-Digit Column Subtraction, with exchanges

Included with membership→