Class 6–7 · Adding fractions
Catch the confident mistake
Step 1 · Predict
Step 2 · Experiment
Put the pieces end to end
Each strip below is 1 whole. Tap the pieces to lay 12 and 13 side by side.
1 whole
1
Your sum
Turbo's 25
Measure
Find the exact answer
Measure the sum with equal pieces. Pick a piece size, then add pieces until they reach the red line exactly.
- Find a piece size that reaches the red line exactly.
- Find a different piece size that also fits exactly.
- Turbo used fifths. Can fifths ever fit exactly? Try 4 and 5 of them.
Step 3 · Observe
Cut Turbo's pieces into same-size pieces and watch what happens:
Sum
Step 4 · Explain
True or false?
Turbo wrote these notes after your experiment. Some are wrong. Mark each one.
Step 5 · Transfer
New numbers every time. Your first try on each question counts. Hints appear if you miss.