lesson
More than a whole
1 · Learn
With the same denominator, add or subtract the number of equal-sized parts. Five sixths plus four sixths is nine sixths.
Nine sixths is more than one whole because six sixths already make one. It is one whole and three sixths. Keep the denominator unchanged: adding pieces does not change their size.
2 · Worked example
For 11/8 − 5/8, remove five eighths from eleven eighths. Six eighths remain.
3 · Your turn
Calculate 7/10 + 6/10 and 9/10 − 4/10.
Check your answer
13/10, or 1 and 3/10; 5/10.
4 · Apply your learning
Use two identical strips divided into tenths to show a sum that crosses one whole.
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