Maths when shopping

Oh yes, I always check, the price for the weight.

We always read the price per 100g on the shelf ( tiny writing under the price )
You sometimes see the larger size on offer , but when you read the cost per 100g it's no cheaper than the other size .

Constantly do comparisons. This week a buy 3 - 300 ml shampoos for £10. Next to them 1 - 500 ml for £4.50 therefore buy two x 500 = 1000ml for £9.00. The 3 for £10 was supposed to be a bargain.

My eye automatically goes to the ‘per 100g’ price on shelves and packets etc, and I calculate the best value from that whenever possible.
Different manufacturers make similar products in different sizes and shaped packets making it difficult to judge the actual contents.

To make matters more complicated, we have a mixture of systems. I just looked up onions on-line at my local shop. 3 lb bags are $4.49, loose are .44c per 100 grams. So some extra calculating to do! Usually at the store there are small labels with the cost per 100/gr, but you need good eyes to read them.

I noticed raspberries are sold in pints, but are from the US, who's imperial measurements are different from ours.

Fun!

Not quite the same,but today in our local Tesco, I spotted a mum and her young son, (about 6 years old) counting a pack of 12 eggs as an educational aid. Great!

Fleurpepper, my mum too, and my grandmother. Amazing when you think of the different coins used

Different story, but your title made me think of my late MIL. She would go around the supermarket with me and the children, chatting away, and then get to the cashier with the exact money ready in her hand- to the amazement of all. Even in her 70s, and until the beginning of Alzheimers.

Quite often, I find that larger items, for example tubs of spread, work out more expensive than buying two smaller of the same item that together add up to the same weight as the larger one. I’m always working things out in my head for the best value.