Here’s a sample New Standards math task for a fourth-grader: Your older cousin has a list of school supplies he needs to start the school year. He has $20 to spend and needs to buy these supplies: ...

Sometimes you are given numbers expressed as a product of prime factors. For example, 8 = 2 3 and 90 = 2 × 3 2 × 5. If you want to find the LCM and HCF in an exam, we can use prime factor form to ...