Have you kiddos improve their number sense, practice addition or subtraction within 20, by using these number bond puzzles for the higher numbers 10 through 20.
The puzzles are self-checking for the most part, since the egg pictures should be easily seen to match, if the correct numbers are used. However, the pattern of egg designs do repeat once or twice, as the numbers increase.
To add a differentiation element, have students use snap cubes. Have the student count out the number of cubes to represent the number on top (larger number). Have them choose a puzzle piece they think will fit, then have them pull apart the number of cubes representing the number on the left. The number of cubes should match the number on the right.