Use these fantastic maths code-breaking worksheets with your students to help them practice, reinforce and consolidate their addition and subtraction bonds to 10 and 20 in an engaging way. Rather than typical maths worksheets, this activity includes a number of fun Halloween GIFs, your students will use their knowledge of number bonds to 10 and 20 to break the code and reveal the sums. There are 3 slides with addition and subtraction to 10 and 3 slides for addition and subtraction to 20. Click o