Make 10 to Subtract

How can making a 10 help you subtract? Grade 1 students practice this clever mental math strategy by breaking apart numbers to find how many items are left. As questions adapt to their skill level, children use ten-frames and visual models that show exactly how to get to 10 first to solve tougher problems. This practice builds a strong number sense and gives students instant feedback as they master subtraction facts within 20.

• Number Sense and Operations
• Subtraction
• Mental Math
• Equations
• Subtract
• Difference
• Whole Numbers
• Number Sense
• Solve

• 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).
• AC9M1N04 — add and subtract numbers within 20, using physical and virtual materials, part-part-whole knowledge to 10 and a variety of calculation strategies
• ENG-MATH-Y1-AS.2 — Represent and use number bonds and related subtraction facts within 20.
• NY-1.OA.6a
• 1.OA.C.6
• MATH.1.3.D
• SG.MATH.P1.NA.WN.2.7
• ZA.CAPS.MATH.G1.NOR.1.13
• MA.1.NSO.2.2
• G1.B2.3
• BC.MATH.G1.CONTENT.03
• AB.MATH.G1.MAT1-OI1-GQ2-LO1

• Add and Subtract with Facts (up to 10)