Subtract within 20 using place value blocks
x3184e0ecadd-and-subtract-within-20--x3184e0ecsubtract-within-20--subtract-within-20-using-place-value-blocks
Add and subtract within 20
Subtract within 20
Sal subtracts 13-4 using place value blocks.
Sal subtracts 13-4 using place value blocks.