It’s time to crack the ‘Secret Code’! The ‘Secret Code’ is a challenging math worksheet for kids with various addition and subtraction problems. The twist in this worksheet is that the answer to each problem represents a certain letter. Kids need to solve all problems correctly and use the key provided to find out the secret message. This free and printable addition and subtraction worksheet is a great way for homeschooling parents and teachers to give the little ones some additional math practice!