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1st Grade Math
9. 1.NBT.A.1
9.2 Missing values in a number grid up to 100
Missing Values in a Number Grid Up to 100
Learn the row and column patterns that let you fill in any missing number on a hundreds chart without counting one by one.
What You'll Learn
Identify that moving one space right on a number grid adds \(1\) and moving left subtracts \(1\).
Recognize that moving one space down adds \(10\) and moving one space up subtracts \(10\).
Apply a neighboring number to solve a blank, for example \(43+1=44\).
Check every answer by working from the opposite direction, such as \(45-1=44\).
Compare numbers in the same column to see they are always all even or all odd.
Solve full hundreds chart puzzles by combining row and column patterns together.
What You'll Practice
1
Finding missing numbers in partially filled number grids
2
Counting forward and backward to fill in grid blanks
3
Identifying number patterns in horizontal and vertical sequences
Why This Matters
Mastering number grids builds your number sense and mental math skills, which are essential for addition, subtraction, and understanding place value. These skills help you quickly navigate larger numbers and solve problems more efficiently in everyday math.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Number Sense
Counting
Place Value
Number Patterns
Number Grid
OH Curriculum Aligned