Crack the Code: Number Names to 20

Become a math detective with this inviting first-grade worksheet! In each of these 11 problems, students will be given a number in standard form which they will rewrite in word form. Then, learners can use the highlighted letters in each word form to discover the secret message!

This worksheet is a great choice for students who are learning about the word form of numbers up to 20. Learners can practice connecting the different forms of numbers as they work on their spelling and handwriting skills. Knowing both the word form and standard form of numbers can help students better communicate about math!

For more practice with number names, check out Match Numbers and Names: Up to 100 and Word Form Up to 100: Cut and Paste.