Algebra Geometry Logical Reasoning Measurement Money
Number Theory Operations Place Value Probability Statistics

Place Value
Abacus

Represent numbers using an abacus (place value)
Abacus (operations)

Find simple sums or differences using an abacus
Base Blocks Represent decimals through thousandths using place-value models
Base Blocks

Represent numbers in base 2, 3, 4, 5, or 10 using place-value models
Base Blocks

Represent whole numbers through thousands using place-value models
Chip Abacus

Regroup ones as tens and tens as hundreds, and vice versa to prepare for regrouping in addition and subtraction