[theBCnut]

Lily, I hope this helps.

1.06%X 1000g=10.6g calcium/kg

10.6g calcium/kg divided by 3945kcal/kg=0.00268695g calcium/kcal

multiply the numerator by 1000=2.68695g calcium

multiply the denominator by 1000= 1000 kcal

put the numerator and denominator back together and you have
2.69g of calcium per 1000kcal

Part of your math problem’s problem was forgetting that 1.06% means 1.06/100