Price my car is packed with opportunities for Stage 3 students to round large numbers up and down to the nearest 10, 100, 1000, 10 000 and 100 000. Rounding up and down is an effective strategy for estimating. When you compare the prices of cars sometimes just a rough amount is OK. Whose car is worth more? Round to the nearest 10 000 for a rough idea. There is an ANSWER CHECKLIST included so your students can work independently.