Witch Hat Mystery Picture: Adding & subtracting to 30

A tall purple witch hat with a floppy tip, a green band and a golden buckle. The pointed shape is easy to recognize, and the bent tip gives it a playful look.

Children add and subtract with numbers up to 30 and cross ten along the way: 17 + 6, 26 − 8, 19 + 5, 30 − 12. Since every answer has to match a row on the grid, results never go past the height of the picture, and the bigger numbers appear mostly as the starting number in a subtraction, such as 27 − 9 or 24 − 7. That makes this topic particularly strong on subtracting across a ten from the twenties, which many children find harder than adding.