# Subtract 7, 8, and 9 from Teen Numbers

Videos to help Grade 1 students learn how to subtract 7, 8, and 9 from teen numbers.

Common Core Standards: 1.OA.1, 1.OA.3, 1.OA.4, 1.OA.6, 1.OA.5, 1.OA.7

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Lesson Plans and Worksheets for Grade 1

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New York State Common Core Math Module 2, Grade 1, Lesson 20

Lesson 20 Problem Set

Complete the subtraction sentences to make them true.
(a) 12 - 9 = ___

(b) 13- 9 = ___

(c) 14 - 9 = ___
Lesson 20 Homework

Complete the number sentences to make them true.
14. Read the math story. Use a drawing or a number bond to show how you know who is right.
a. Elsie says that the expressions 17 - 8 and 18 - 9 are equal. John says they are not equal. Who is right?
b. John says that the expressions 11 – 8 and 12 – 8 are not equal. Elsie says they are. Who is right?
d. John and Elsie are trying to find several subtraction number sentences that start with numbers larger than 10 and always have an answer of 7. Help them figure out number sentences. They started the first one.

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