P3 Large numbers and operation order
Today’s problem — free all day, every step. Every day has one.
subtract with a four-digit algorithm
Calculate 6243 − 2785.
Show the answerHide the answer
See all 5 steps
MathBrush is being tested with a few parent groups, and every solution on the site is open to them — one household, all children. If you were given a code, it goes in once and this device remembers it.
I have a code → See the free ones
65 worked examples are free without a code, two from every pattern. No account, either way.
The pattern behind it: Large numbers and operation order
Group digits by place value, then do brackets and multiplication or division before addition or subtraction.
In this one. A written algorithm keeps ones under ones and every other place aligned.
How to spot it
Two numbers to add with carrying, several numbers to put in order, or a sum mixing addition, multiplication and brackets, all point here.
Common mistake
Children forget to carry a ten into the next column, or compare digits from the left without first checking the numbers have the same number of digits.
Try one like it
Standard add two-digit numbers mentally Calculate 94 + 38 mentally.The 33 problem patterns
All 33 patterns, one to a page — the 19 behind Primary 5 and 6 word problems, and the skills the younger years are built on. The bar model, how to spot it in the question, and the mistake children make. A booklet you can print. Free.
A PDF, and a note when new solutions go up.