Lesson 5 - Subtracting Mentally

To encourage your child to have fun on the Web while learning about Subtracting Mentally, here are some games and interactive activities they can do on their own or in pairs.

Goal

Develop mental math strategies for subtracting 2-digit numbers.

Builds Upon

Student Book pages 100-101

Instructions for Use

Bricks prompts your child to use mental math to subtract numbers.

Choose Inverse Operation Bricks, and then click on a target - Easy, Normal, Tricky or Difficult. Fill in the values in the empty bricks, starting from the top and subtract downwards. Check your score with the cat by clicking on 'Check'. Continue subtracting empty bricks until the score is reached.