Count the whistles. Now choose the best answer. \(20 \, + \, 0 \, = \, x\)

\(2 \, tens \, + \, 0 \, ones \, = \, 20\)

\(0 \, tens \, + \, 2 \, ones \, = \, 20\)

\(0 \, tens \, + \, 2 \, ones \, = \, 14\)

\(2 \, tens \, + \, 0 \, ones \, = \, 20\)

\(2 \, tens \, + \, 0 \, ones \, = \, 11\)

Count the apples. Now choose the best answer. \(1 \, + \, 1 \, = \, x\)

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

\(1 \, ten \, + \, 0 \, ones \, = \, 11\)

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

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

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

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

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

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

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

\(0 \, tens \, + \, 3 \, ones \, = \, 20\)

\(3 \, tens \, + \, 0 \, ones \, = \, 11\)

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Counting

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Iowa Core Mathematics

Grade 1 - Number and Operations in Base Ten

Standard 1.NBT.B.2a - Count the objects from 1 to 20. Split the number into tens and ones to complete the equation.

Included Skills: Counting

Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases: 10 can be thought of as a bundle of ten ones - called a "ten."