Number Puzzles

We have these puzzles seen above. One piece is the number. The next is a picture representing the number. The last piece is the number word. DS has no problem putting together the first two pieces. If I am right there when he is putting them together I will spell the word as he finds it. Today I had the idea to give him the word flashcards. On one side is the number and picture. The other side has the word. It worked great. He matched the word then flipped it over to see what number the word belonged to.