Grade 1 Math Unit 9 Addition & Subtraction Pt.3
Unit 9 Addition & Subtraction Pt.3
Content Emphasis/ Big Ideas
- Students will solve addition and subtraction problems within 20 using various strategies (e.g., inverse relationships: if 9 + 3 = 12 then 12 - 3 = 9; decomposition using known sums/differences and the use of known doubles facts.
- Students will solve addition & subtraction problems (join, separate, and part-part-whole) within 20, including those in context, using words, objects, drawings, or numbers. g) Determine the unknown whole number that will result in a sum or difference of 10 or 20 (e.g., 14 - __ = 10 or 15 + __ = 20).
Standards:
- 1.CE.1 The student will recall with automaticity addition and subtraction facts within 10 and represent, solve, and justify solutions to single-step problems, including those in context, using addition and subtraction with whole numbers within 20.
Skills:
- Doubling
- Adition through 20
- Subtraction through 20
Doubles
Instructional Videos
Doubles