Count the chairs. Now choose the best answer. \(18 \, + \, 8 \, = \, x\)

\(1 \, ten \, + \, 8 \, ones \, = \, 18\)

\(8 \, tens \, + \, 1 \, one \, = \, 15\)

\(8 \, tens \, + \, 1 \, one \, = \, 18\)

\(1 \, ten \, + \, 8 \, ones \, = \, 19\)

\(1 \, ten \, + \, 8 \, ones \, = \, 18\)

Count the lamps. Now choose the best answer. \(10 \, + \, 0 \, = \, x\)

\(1 \, ten \, + \, 0 \, ones \, = \, 10\)

\(1 \, ten \, + \, 0 \, ones \, = \, 13\)

\(1 \, ten \, + \, 0 \, ones \, = \, 10\)

\(0 \, tens \, + \, 1 \, one \, = \, 10\)

\(0 \, tens \, + \, 1 \, one \, = \, 18\)

Count the hats. Now choose the best answer. \(13 \, + \, 3 \, = \, x\)

\(1 \, ten \, + \, 3 \, ones \, = \, 13\)

\(3 \, tens \, + \, 1 \, one \, = \, 13\)

\(3 \, tens \, + \, 1 \, one \, = \, 17\)

\(1 \, ten \, + \, 3 \, ones \, = \, 10\)

Count Groups of Tens and Ones Up to 20 - Grade 1

Counting

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Alberta Mathematics curriculum

Grade 1 - Number

Standard 1.N.3 - Count the objects from 1 to 20. Split the number into tens and ones to complete the equation.

Included Skills: Counting

Demonstrate an understanding of counting by: • indicating that the last number said identifies "how many". • showing that any set has only one count. • using counting-on. • using parts or equal groups to count sets. • Answer the question, "How many are in the set?", using the last number counted in a given set. • Identify and correct counting errors in a given counting sequence. • Show that the count of the number of objects in a given set does not change regardless of the order in which the objects are counted. • Count the number of objects in a given set, rearrange the objects, predict the new count and recount to verify the prediction. • Determine the total number of objects in a given set, starting from a known quantity and counting on. • Count quantity, using groups of 2, 5 or 10 and counting on. • Record the number of objects in a given set (up to 100).