Filter by
Add, subtract & round 6-/7-digit numbers
In-depth Investigation: Sometimes We Lose Things from nrich.maths.org.
Solve equations with two unknowns
In-depth Investigation: This Pied Piper of Hamelin from nrich.maths.org.
Place value in 3-place decimals
In-depth Investigation: The Size and Distance of the Planets from cse.ssl.berkeley.edu