Subtract within 20 using a number line
x3184e0ecadd-and-subtract-within-20--x3184e0ecsubtract-within-20--subtract-within-20-using-a-number-line
Add and subtract within 20
Subtract within 20
Sal subtracts 17 - 9 using a number line.
Sal subtracts 17 - 9 using a number line.