Maryland Math 1.NOS.B.6
The Standard
Estimate the location of numbers on a number line by reasoning about their relationship to benchmark numbers (e.g. 10, 50, 100).
Maryland College and Career Ready Standards for Mathematics (2025) · UNDERSTAND PLACE VALUE AND REPRESENTATIONS OF NUMBERS.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students place numbers about where they belong on a number line. They use marked numbers such as 10, 50, and 100 to decide which spot makes sense.
What Mastery Looks Like
- On a line from 0 to 100, a student places 20 closer to 0 than to 50, and 80 closer to 100 than to 50. They explain their choices without counting every number.
Common Misconceptions
- Students may place 70 before 50 because they lose track of which way numbers increase. They may put 60 halfway between 50 and 100, rather than just past 50.
How to Assess It
- Draw a line with evenly spaced marks at 0, 50, and 100. Ask students to mark about where 30 and 85 go and explain one choice.
Lesson moves
Ways to Teach It
Tape a floor line with 0, 50, and 100 evenly spaced, then have students place number cards for 15, 55, and 90.
Show a line marked 0, 50, and 100, and ask, "Should 65 go closer to 50 or 100? Why?"
In pairs, draw cards for 12, 36, 64, and 91, place them on a 0 to 100 line, and compare placements.
Cover a meter stick's labels except 0, 50, and 100, then estimate where a 70-centimeter ribbon would end.
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Printable 1.NOS.B.6 Worksheet
A ready-to-print activity worksheet aligned to 1.NOS.B.6, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 4.NOS.A.1.b
Estimate quantities by reasoning about their location on a number line, their relationship to benchmark numbers, and rounding to any place.
- 2.NOS.A.5
Estimate quantities by reasoning about their location on a number line, their relationship to benchmark numbers (e.g. 10, 50, 100), and to assess reasonableness...
- 6.NOS.C.6.a
Estimate quantities by reasoning about their location on a number line, their relationship to benchmark numbers, and by rounding.
- 3.NOS.A.1.c
Estimate quantities by reasoning about their location on a number line, their relationship to benchmark numbers, and rounding to nearest 10 or 100.
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