Split the total
Two amounts make a total, such as two children who weigh 51 kg together, or a 43 cm ribbon cut into two pieces. One or two rules narrow it down: the two are different, one is bigger, each is between two numbers, both are odd, or they are less than 5 apart. The student types any pair that adds up to the total and keeps every rule.
There is never just one answer: every question has at least four. The working starts in the middle (half the total) and moves outwards, checking each pair against the rules until one fits, then names a couple of others that work too.
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What changes each time
- Totals from 10 to 99, in kilograms, centimetres, points, dollars, children or marbles
- One or two rules: different, bigger or smaller, a range, even or odd, or how far apart
- Six stories, from two children's weights to two jars of marbles
More addition and subtraction practice
- Single-digit addition and subtraction (Grade 1)
- Ten frames: making 10 and 20 (Grade 1)
- Number bonds (Grade 1)
- Jumps on a number line (Grade 1)
- Money word problems on a number line (Grade 2)
- Column addition with carrying (Grade 2)
- Column addition (Grade 3)
- Column subtraction (Grade 3)
- Subtracting with regrouping (Grade 3)