Mental maths
Mental Math Shift Lab
Strengthen mental addition and subtraction by shifting 3 and 30.
Open Mental Math Shift LabMathematics · Grade 2
Reason about numbers, operations and parts of a whole.
Grade 2 combines mental-math shifts, expanded form, subtraction facts, column arithmetic, number pyramids and visual fraction models so children connect addition and subtraction with place value and early fraction reasoning.
Available now
Six Grade 2 reasoning paths
Use Mental Math Shift Lab for ±3 and ±30, Expanded Form Lab for hundreds, tens and ones, Subtraction Fact Explorer for subtraction/addition connections, Missing Digit Detective for place-value arithmetic, Number Pyramid Lab for forward and reverse addition, and Fraction Explorer for visual parts-of-a-whole reasoning.
Place value
Expanded Form Lab
Partition three-digit numbers into hundreds, tens and ones, then rebuild standard form.
Open Expanded Form LabSubtraction
Subtraction Fact Explorer
Explore subtract-by families, missing differences and numbers, number-line jumps, inverse addition and fact families.
Open Subtraction Fact ExplorerPlace value
Missing Digit Detective
Reconstruct hidden digits in addition and subtraction, including carrying and borrowing.
Open Missing Digit DetectiveAddition relationships
Number Pyramid Lab
Build upward from a base or work backward from mixed clues. Every upper block is the sum of the two below.
Open Number Pyramid LabFractions
Fraction Explorer
Read and shade fraction models, use a fraction wall, spot equivalents, compare fractions, and add fractions with matching denominators.
Open Fraction Explorer