Add to see if always carries a 1
Placebo: 24 + 35 Placebo: 36 + 49 Placebo: 12 + 34 + 21 46+18+27=91 if correct, 82 if carried 1
Add to see if 8+7 is 1 foot 5 inches or 3 inches
1 foot 8 inches + 7 inches
1 foot 8 inches + 7 inches
Subract to see if always takes smaller number from larger one
Placebo: 85 – 23 Placebo: 374 – 145 86–68=18 if correct, 22 if little from big Extra for experts: subtracting across zeros

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True or false for 5=2+3, 7=7, 4+6=8+2
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