Large Numbers

FreeEasy
📊

Understanding 100 Million

How big is 100 million? Tap through the place-value chart of 100000000, meet the hundred-millions place, and see how digits group into periods.

hundred millionsplace valuelarge numbers10min
FreeEasy
📊

Place Value and Periods

Tap every digit of the sample number 123456789012 to explore the place-value chart and see how digits group into periods.

place valueperiodslarge numbers10min
FreeEasy
📊

Rounding - Integers

Understand rounding for integers, learn the concept of rounding at different place values

roundingintegersbasics10min
FreeEasy
📊

Rounding Decimal Numbers

Understand rounding for decimals, learn the concept of rounding decimals

roundingdecimalsbasics10min
FreeEasy
📝

Reading & Writing Large Numbers

See how large numbers are read period by period, with special rules for zeros inside and at the end of each group.

readingwritingperiods12min
FreeMedium
⚖️

Comparing Large Numbers

Understand the size relationship of large numbers through digit-by-digit comparison

large numberscomparisonplace value15min
FreeMedium
📐

Lines and Surfaces

Understand how a line segment sweeps to form a plane, master the relationship between length and area

line segmentplanearea15min

Related Themes for This Grade

Fraction Basics

Understand the concept of fractions, learn how to represent and compare fractions

Area Basic

Understand the concept of area, learn about area units and calculation methods

The Four Operations

Learn the four basic operations: addition, subtraction, multiplication, and division

Multi-digit × & ÷

Understand 2-digit × 2-digit with area models, then master every step of long division

Intro to Decimals

Meet tenths and hundredths with area models and number lines, then learn to read and compare decimals

Angles & Lines

Measure angles with a protractor, recognize parallel and perpendicular lines, and find every line of symmetry