This set corresponds with our Creepy Crawly 10 Frame Counting Mats (1-10). This set includes 2 designs, 3 frame options (pictures and numbers, pictures without numbers, and no pictures with numbers) number cards 11-20, a subtraction and an addition worksheet for numbers 11-20. If you want to use manipulatives, we suggest using plastic bugs and ants. Our store also carries a bundle set 1-20 at a discounted price. This math activity aligns with Common Core. If you are looking for more Creepy Crawly Bug activities, check out our Bug Day Mini Unit and Picnic Day Mini Unit!