Count the skateboards. Now choose the best answer. \(12 \, + \, 2 \, = \, x\)

\(1 \, ten \, + \, 2 \, ones \, = \, 12\)

\(2 \, tens \, + \, 1 \, one \, = \, 12\)

\(1 \, ten \, + \, 2 \, ones \, = \, 12\)

\(2 \, tens \, + \, 1 \, one \, = \, 10\)

\(1 \, ten \, + \, 2 \, ones \, = \, 14\)

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

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

\(0 \, tens \, + \, 1 \, one \, = \, 11\)

\(1 \, ten \, + \, 0 \, ones \, = \, 18\)

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

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

Count the fire trucks. Now choose the best answer. \(3 \, + \, 3 \, = \, x\)

\(0 \, tens \, + \, 3 \, ones \, = \, 3\)

\(3 \, tens \, + \, 0 \, ones \, = \, 15\)

\(0 \, tens \, + \, 3 \, ones \, = \, 18\)

\(3 \, tens \, + \, 0 \, ones \, = \, 3\)

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

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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:

Demonstrate an understanding of counting by:
• indicating that the last number said identifies “how many”
• showing that any set has only one count
• using the counting on strategy
• using parts or equal groups to count sets.

• Achievement Indicators:
- 1N3.1 Answer the question, “How many are in the set?”, using the last number counted in a given set.
- 1N3.2 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.
- 1N3.3 Count the number of objects in a given set, rearrange the objects, predict the new count and recount to verify the prediction.
- 1N3.4 Record the number of objects in a given set (up to 100).
- 1N3.5 Determine the total number of objects in a given set, starting from a known quantity and counting on.
- 1N3.6 Identify and correct counting errors in a given counting sequence.
- 1N3.7 Count quantity, using groups of 2, 5 or 10 and counting on.

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