Six ten frames filled with pepperoni slices, each with a subtraction problem underneath. The child crosses out the pepperoni being taken away and writes how many are left.
A ten frame lets a child see a number without counting every piece: a full top row is five, a full frame is ten. So 8 − 2 starts from a picture of five and three more, and 10 − 6 starts from a full frame.
The problems mix easy ones like 7 − 2 with 8 − 7 and 5 − 5, where the answer is small or zero, so a child has to look carefully rather than guess.