Why ESL Students Get Maths Word Problems Wrong (Even When They Know the Maths)

A student who can solve `14 + 8` in seconds will sometimes stare blankly at "Maria had 14 stickers. Her friend gave her 8 more. How many does she have now?" The maths hasn't changed. What's changed is that the problem is now wrapped in a sentence, and for an ESL student, the sentence is doing most of the work.

This is the trap teachers fall into when a word problem goes badly: assuming the student needs more maths practice, when what they actually need is help unpacking the language around numbers that are already familiar to them. A student who can compute fluently on a bare worksheet of sums can still fail every word problem on the same page, and the two results tell you very different things about what to teach next. Once you treat word problems as a reading task with a calculation at the end, rather than a calculation wearing a light disguise, the teaching approach changes completely.

Word problems are a language problem first

The operation words in a word problem don't map cleanly onto "add" or "subtract" the way a plus or minus sign does. "Altogether," "in total," and "combined" all signal addition, but none of them look like the word "add." "Left," "gave away," and "fewer than" all signal subtraction, but a student translating word by word from their first language can easily land on the wrong operation, especially when a word has a completely different everyday meaning. "Left" is the classic trap: a student who knows "left" as a direction has to relearn it as "remaining" in this context, and nothing about the word itself hints at that.

This is why a student can correctly compute 14 + 8 = 22 in isolation and still write 14 minus 8 = 6 for the sticker problem above. The arithmetic was never the issue. The phrase "gave her" reads to an inexperienced English learner as something being taken away, not added, because "gave" and "gave up" feel similar before a learner has built enough vocabulary to tell them apart. Multiply that one keyword trap across a whole worksheet of mixed operations and it's easy to see why a confident, capable student can score badly on a page that looks, to an adult reader, perfectly straightforward.

Build the maths word wall before you hand out problems

Before word problems go in front of students, the vocabulary needs to exist for them somewhere other than the problem itself. A maths word wall works well here: a running, visible list of addition words (altogether, in all, combined, sum, more than) and subtraction words (left, remaining, fewer, difference, took away), grouped by operation and kept up all term rather than introduced once and forgotten.

The useful version of this wall isn't just words, it's the words next to a tiny worked example. "Altogether: 3 apples and 2 apples, altogether 5 apples" teaches the word in context, which matters more for ESL learners than a bare definition. Revisit the wall for thirty seconds at the start of any lesson that includes word problems, pointing to the relevant column before students start rather than after they've already misread the question.

For mixed-level groups, colour-code the wall by grade band, or keep two smaller walls side by side, so a Grade 1 group isn't wading through Grade 3 vocabulary to find their own words. A wall that stays current also becomes a fast diagnostic tool: if a student keeps choosing the wrong operation, check whether the keyword in question is actually on the wall yet, rather than assuming the gap is in the maths itself.

Separate reading the problem from solving the problem

One of the most useful habits to teach is reading a word problem twice, for two different jobs. The first read is just to find the numbers and draw a quick picture or bar model of what's happening: two groups combining, one group losing some, two groups being compared. No calculation happens on this pass. The second read is where the operation gets chosen and the sum gets done.

This matters because ESL students often try to translate and calculate in the same pass, which overloads them. Splitting the two jobs means a shaky reading of the sentence doesn't automatically wreck the maths that follows. A simple bar model, two boxes joined for addition, or one box with a piece crossed out for subtraction, gives students a way to represent the situation that doesn't depend on getting every word right the first time.

For self-study or homeschool use, this is easy to adapt without any classroom equipment: a parent can ask "can you draw what's happening in this problem, before you work anything out?" and get most of the same benefit. It also gives a parent with no teaching background a concrete way to check understanding without needing to mark the maths themselves.

Give students a sentence frame for the answer, not just the number

Most word-problem practice stops at the number, but asking students to answer in a full sentence using a fixed frame ("Maria has ___ stickers altogether" or "There are ___ apples left") reinforces the exact vocabulary that caused the confusion in the first place. It also surfaces a wrong operation faster: a student who writes "Maria has 6 stickers altogether" after being given away 8 more stickers will often notice the answer sounds wrong once they have to say it back in words, even if they didn't catch the error while calculating.

Keep the frame identical to the vocabulary on the word wall, so students are reusing the same handful of terms across a worked example, the word wall, and their own answer. Repetition across all three is what makes the vocabulary stick, rather than a single explanation on the day the topic was introduced. Over a few weeks of consistent use, most students stop needing the frame written out and start producing it from memory, which is a reasonable sign the vocabulary itself has finally settled.

Choose word problems that match the vocabulary you've actually taught

It's worth checking a worksheet's language level before assigning it, the same way you'd check the number range. A word problem with an unfamiliar setup, a shopping scenario, a sports scenario, an unfamiliar object, adds a second layer of vocabulary on top of the maths vocabulary, and for a student still building both, that's often one layer too many in a single sitting. Starting with familiar, concrete objects (stickers, apples, pencils) and only introducing new scenario vocabulary once the operation words are secure keeps the two challenges separate rather than compounding them.

This works equally well as a small-group classroom routine or a five-minute daily habit at home: the word wall stays visible, the bar model gets drawn first, and the answer goes into the same sentence frame every time. None of this requires new materials, only a consistent order of operations for how the problem gets approached before a single number gets written down.