ABE Math Tutorials/Whole numbers/Introduction/Addition and Subtraction Facts

Addition and subtraction facts
This is the first lesson to go over your preknowledge on basic addition and subtraction.



Mark yourself: Ready for the answers? Here they are: (1)12; (2)4; (3)21; (4)5; (5)12; (6)40; (7)5; (8)8; (9)32; (10)12; (11)8; (12)9; (13)8; (14)12; (15)8; (16)14; (17)54; (18)2; (19)14; (20)7.