Represent teen numbers with addition and subtraction equations involving one 10. Represent 10 using a number bond and 10-frame with a missing addend. Use Notice and Wonder with a 10-frame, connecting ...
When we add or subtract 10 from a number only the number in the tens column changes. There are 70 pencils in the classroom. How many pencils are left if 10 pencils are being used? There are 60 pencils ...