Work out addition practice instantly with clear inputs, formula shown and shareable results.
The correct sum is the two numbers added, and the marking compares it against the answer the child gave so the size and direction of the slip is visible. Most addition errors are carry errors, so knowing whether a units-column carry was required tells you exactly which step to re-teach.
Sum
Sum = first number + second number
Marking
Error = answer given - correct sum; a carry is needed when units(a) + units(b) >= 10
Sum = first number + second number. The correct sum is the two numbers added, and the marking compares it against the answer the child gave so the size and direction of the slip is visible.
Most addition errors are carry errors, so knowing whether a units-column carry was required tells you exactly which step to re-teach.
Enter first number, second number, answer given. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.