wunder beta

🏙️ Multi-Step Problems with Large Numbers

Work through problems that stretch into the millions and include decimals, choosing between mental math, written methods, or a calculator - and defending your choice.

2
lessons
~15 min
to learn
🔢 Math
subject
Ages 6–12
level
Start the course →

What you’ll learn

  1. Problems in the MillionsSolve a two-step addition and subtraction problem with numbers beyond 1,000,000.Large problems break into steps. For a £4,250,000 budget spent on roads (£1,780,000) and parks (£950,000), first add the spending to get £2,730,000, then subtract to find £1,520,000 left. The same column methods work - there are just more columns.
  2. Choosing and Defending Your MethodChoose between mental, written, and calculator methods and justify the decision, including with decimals.Round numbers like 3,000,000 + 2,000,000 are instant mentally; close ones like 6,000,000 - 5,999,000 count up to 1,000; messy seven-digit sums suit a calculator. With decimals, line up the points (write 8.4 as 8.40) and subtract as usual. The real skill is picking the smart tool and saying why.

Questions this course answers

In the budget problem, what must you do FIRST?

Combine the spending before subtracting from the budget.

For 6,000,000 - 5,999,000, what is the smartest method?

Close numbers are fastest by counting up.

Which calculation is best done on a CALCULATOR?

Messy seven-digit numbers are safest on a calculator.

When subtracting 12.75 - 8.4, why write 8.4 as 8.40?

Matching decimal places keeps the columns aligned.

Grounded in trusted sources

  • Khan Academy
  • BBC Bitesize - Maths
  • NRICH - University of Cambridge
  • Math is Fun

Every Wunder lesson is built from real, reputable sources — never invented.

Related Math courses

🧮Multi-Step Addition and Subtraction Problems🔍Checking Answers by Rounding🔢Number Patterns and Sequences🌡️Positive and Negative Numbers🔤Reading and Writing Algebra⚖️Solving Linear Equations🔢Substituting Values into Formulas🔟Subtracting Multiples of 10

Wunder is a personalized learn-anything platform — tell it any topic and it builds a beautiful, fact-checked course in minutes, with narration, a knowledge check, and a college-style University track.

Browse more Math courses · All topics · Home

© 2026 Wunder Learning LLC · Terms & Privacy