First Grade · Math · week 17

Number-line neighborhoods

Use a number line to locate a two-digit number and find nearby numbers, such as before, after, and between.

A number line is like a street with houses in order. Every number lives at its own address, with smaller numbers to the left and bigger numbers to the right. Numbers right next to each other are neighbors.

If you know where 40 lives, you can find its neighbors without counting from zero: 39 lives just before it, and 41 lives just after it.

📋 For the teacher
Teach it (10–15 min):
  • Draw or print a long number line and physically walk a finger left and right along it.
  • Use the word "neighbor" consistently -- it makes the idea of "one more, one less" concrete.
  • Ask for the number before AND after the same number to practice both directions.
  • Point out that moving right always means bigger, and left always means smaller -- true anywhere on the line.
Talk about it:
  • Which direction on a number line means bigger numbers?
  • What are the two neighbors of 45?
  • How do you find the number between two other numbers?

Mastery looks like: They find the number immediately before, after, or between given numbers using a number line.

Common stumbles: Mixing up left (smaller) and right (bigger); giving a number two away instead of a true neighbor.

See it visually

Interactive, spoken-aloud tools that show this idea in motion.

Number LineCount, add, subtract, and skip-count with animated hops and a friendly voice.try →
Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
Records attendance + 15 min of Math for this learner.
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