
Nelson EducationSchoolMathematics 4  
Lesson 5  Subtracting MentallyTo encourage students 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.
GoalDevelop mental math strategies for subtracting 2digit numbers.
Builds UponStudent Book pages 100101
Instructions for Use
Bricks prompts students 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. 
