This free frog themed resource is designed to help develop conceptual understanding of one less/ more and ten less/ more for numbers 0-120 using base ten blocks with first and second graders.
A great way to help children with subtraction with regrouping, especially if you do not have base ten blocks. This printable consist of 20 cards that look exactly the same, just have different expressions. $2
Super-Sized Subtraction- life sized base ten blocks to act out subtracting multiples of ten
Place Value Addition Task Cards, Laminate and kids can regroup with a dry erase marker.