Teach math skills with number lines by using these double-sided cards. The front of the card provides objectives, resources needed and the procedure. The back offers visual examples. Topics include odd & even numbers, greater than, less than, addition, subtraction, skip counting, multiple addition, tiding numbers, place value, reversibility, multiplication, absolute value, fractions and decimals. 50 activity cards, plus a contents card that can act as a checklist. For ages 5 and up.