Count the trains. Now choose the best answer. \(15 \, + \, 5 \, = \, x\)

\(1 \, ten \, + \, 5 \, ones \, = \, 15\)

\(5 \, tens \, + \, 1 \, one \, = \, 14\)

\(1 \, ten \, + \, 5 \, ones \, = \, 15\)

\(1 \, ten \, + \, 5 \, ones \, = \, 20\)

\(5 \, tens \, + \, 1 \, one \, = \, 15\)

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

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

\(1 \, ten \, + \, 0 \, ones \, = \, 14\)

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

\(0 \, tens \, + \, 1 \, one \, = \, 12\)

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

\(0 \, tens \, + \, 2 \, ones \, = \, 17\)

\(2 \, tens \, + \, 0 \, ones \, = \, 10\)

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

Counting

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

10 can be thought of as a bundle of ten ones — called a 'ten.'