Virginia SOL 1.NS.2.d
The Standard
Describe the number of groups of tens and ones when given a two-digit number and justify reasoning.
Virginia Standards of Learning for Mathematics · The student will represent, compare, and order quantities up to 120.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students break a two-digit number into full groups of ten and leftover ones. They explain their answer using objects, drawings, place value language, or an addition equation.
What Mastery Looks Like
- A student identifies 58 as five groups of ten and eight leftover ones. The student can prove it with bundled objects, a drawing, or the equation 50 + 8 = 58.
Common Misconceptions
- Students may reverse the digits and call 47 four ones and seven tens. Some count each object but do not recognize complete groups of ten. Others name the tens and ones correctly but cannot prove their answer with a model or equation.
How to Assess It
- Give students the number 63. Ask them to draw it, label the tens and ones, and write one sentence explaining how the drawing proves their answer.
Lesson moves
Ways to Teach It
Give pairs 36 connecting cubes; students build trains of ten, leave extras loose, then label the tens and ones.
Show 52 with a quick drawing, then ask, "How does your picture prove there are five tens and two ones?"
Students draw number cards, build each number on a place value mat, and earn a point for a correct explanation.
Tell students 68 pencils are packed in boxes of ten; they determine the full boxes and loose pencils, then explain their answer.
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Printable 1.NS.2.d Worksheet
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Related Standards
- 2.NS.2.d
Investigate and explain the ten-to-one relationships among ones, tens, and hundreds, using models.
- 2.NS.2.c
Apply patterns within the base 10 system to determine and communicate, orally and in written form, the place (ones, tens, hundreds) and value of each digit in a...
- 1.NS.2.c
Create a concrete or pictorial representation of a number using tens and ones and write the corresponding numeral up to 120 (e.g., 47 can be represented as 47 o...
- 1.NS.1.e
Group a collection of up to 120 objects into tens and ones, and count to determine the total (e.g., 5 groups of ten and 6 ones is equal to 56 total objects).
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