Hide a ten, seek a ten, make a ten, break a ten. How many ways can we make number ten? In this video, students learn to anchor problems to number ten, a common way to problem solve. For example, the problem 9+3 might be unfamiliar, but if we split number 3 into 1+2, we can create a ten. We are left with 9+1+2, or 10+2. Anchoring to ten is a way to promote critical thinking and number manipulation.

Review addition properties and fact families and ways to solve addition and subtraction problems

Practice making a ten by breaking apart an addend. For example 9+3 is the same as 9+1+2, which is 10+2

Practice solving subtraction sentences by breaking numbers into tens

Standards addressed

CCSS.MATH.CONTENT.1.OA.C.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).