Subtraction within 20

14 minus 3 =

• 11

• 12

Tags

CCSS.2.OA.A.1

20 minus 6 =

• 13

• 14

• 15

Tags

CCSS.2.OA.A.1

18 minus 5 =

• 11

• 12

• 13

• 14

Tags

CCSS.2.OA.A.1

15 minus 3 = _______

Tags

CCSS.2.OA.A.1

19 minus 7 = _____

Tags

CCSS.2.OA.A.1

17 minus 1 = ____

Tags

CCSS.1.OA.C.6

16 minus 6 = ____

Tags

CCSS.2.OA.A.1

15 minus 4 = _______

When I subtract from ones, what are the 2 steps that I will be doing?

• 5 minus 4

• 10 + 1

• 10 minus 4

Tags

CCSS.2.OA.A.1

I have learnt 2 methods when I do subtraction within 20 : Counting Backwards and Subtracting by Ones. Which method is easier, Counting Backwards or Subtracting by Ones?

• Counting Backwards.

• Subtracting by Ones.

Tags

CCSS.1.OA.C.6

CCSS.2.OA.B.2