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 ...

Subtract within 1000 using various representations, strategies, and algorithms. Warm up with a Mystery Math Mistake to find a mistake made in using an algorithm for addition and subtraction. Subtract ...

Rita Bennett understands that teaching math to her second graders these days adds up to a whole lot more than 2 + 2 = 4. On one recent morning she presented the following problem to her Simi Valley, ...

Young children can crudely add and subtract numbers before they have learned the rules of arithmetic, a new study finds. Researchers presented five- and six-year-old children with problems such as, ...

Math is currently being taught in a way most people over the age of 30 may not understand. It doesn’t take anything more than a multi-step subtraction problem to result in a wide spectrum of reactions ...