The children wanted to raise money to help the homeless shelter (Chiku Centre in Yokohama). We took part in onigiri making with the high school. This led to us having our own day to make the food.
We asked the children what ingredients they would need and how they would pay for them. The children quickly realised this would take lots of money. How would they pay?
The children did 10×10 jobs which made 100 yen. This helped the children group into 100’s. The children also raised money from their cardboard arcade. This money was collected in a pickle jar. The children counted all the money, making piles of 10’s. 100’s and 1000’s.
The children quickly became aware that they needed 30kg of rice to make the onigiri. They weighed the rice the KG and Gr2 children brought to play the arcade. They estimated, used balance scales and weighed and finally used digital scales. They discussed the accuracy of each method. This involved using weights and adding the amount. The children accurately measured the rice, there was 22kgs.