 ## Common Core State Standards for Mathematics

Grade(s) 1 resources related to the following standard:
Operations and Algebraic Thinking
Add and subtract within 20.
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).

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This interactive Flash applet contains a progressive range of exercises to sharpen mental math and recall of number facts. Levels include one-digit addition and subtraction within 20, two-digit addition and subtraction within 100, and multiplication up to x5 and x10. The goal is to complete 10 correctly as quickly as possible. An incorrect answer deletes a point, discouraging guessing. At the end of each round the applet reports the time taken and the number of errors.
Activity, Interactive Media
Grade Level: 1, 2, 3, 4
(0 Comments)
This interactive and animated Flash book, the first by collaborators Greg Tang and Harry Briggs, presents 16 riddles that use clever, visual tricks to challenge children to add and eventually multiply numbers in efficient groups. The best solutions are the least obvious, which teaches children to be more thoughtful, strategic, and open-minded.
Activity, Interactive Media, Illustration, Video
Grade Level: K, 1, 2
(0 Comments)
This applet counts according to the starting number, the increment of change, and the speed selected by the user. It can be used flexibly by students or by the teacher as part of a lesson. Its applications include skip counting (forward and backward), exploring number patterns, integer addition and subtraction, decimals, and division. Suggestions for instructional use are provided.
Interactive Media
Grade Level: K, 1, 2, 3, 4, 5
(1 Comments)
This iOS app provides students in grades K-2 with practice counting, writing numerals, addition and subtraction. The user can select the grade level and adjust the time of practice; the app then generates a selection of activities from the base six activities of the app. At the end of the practice the app asks for feedback on the level of difficulty in order to make adjustments for the next practice session.
Activity, Interactive Media, Mobile App
Grade Level: K, 1, 2
(0 Comments)
This web page provides instructions for a game that develops number sense, basic addition and subtraction skills, and strategic thinking. Beginning with 10 Cuisenaire rods, one of each length from 1 (white) and 10 (orange), two players take turns adding one rod at a time to a train until it reaches a previously agreed-on length between 11 and 55. The player who puts down the last rod to complete the goal length is the winner. The game can be played with real rods, with the Flash applet provided, or with numbers on paper.
Activity, Game, Interactive Media
Grade Level: 1, 2, 3, 4
(0 Comments)
This Flash-based game of chance helps children learn to move along a number line either side of a central point, as a precursor to working with negative numbers. Two players, one Plus and one Minus, take turns rolling and adding two dice, and moving forward or backward in their respective directions on the line, with the goal of reaching their end of the line first (0 or 27). The game can be played with the applet or on paper (printable pdf included). A variation involving the choice of adding or subtracting introduces strategic thinking. The Teacher' Notes page suggests strategies for introducing the game, questions to facilitate students' thinking, and a link to a simpler version of the game (Incey Wincey Spider) and a more advanced one (Tug Harder!), both cataloged separately.
Activity, Game, Interactive Media
Grade Level: K, 1, 2
(0 Comments)
This interactive Flash applet can be used to assess or reinforce children's understanding of number sequence and their subtraction skills. The applet displays a set of randomly placed number cards from to 1 to 20 with one card highlighted. The student identifies the number card that is 2 less than the highlighted card. Clicking on a question mark (?) at the bottom of the screen reveals a temporary number line as an aid. On completion a score appears. After 5 errors on a single example, a message appears prompting the student to ask someone for help.
Activity, Interactive Media
Grade Level: K, 1, 2
(1 Comments)