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Place 6-digit numbers on lines and round
In-depth Investigation: Nice or Nasty (Game 2, Nasty Version) from nrich.maths.org.
Solve equations with two unknowns
In-depth Investigation: This Pied Piper of Hamelin from nrich.maths.org.
Add, subtract & round 6-/7-digit numbers
In-depth Investigation: Sometimes We Lose Things from nrich.maths.org.