Welcome to the Mental Subtraction Skill Development Page!
Here, you will learn how to confidently answer questions just like this sample question.
Your goal is to be able to complete the questions within Activities 4a, 4b, 4c and 4d with total confidence, and the learning activities are here to help you achieve this. How you use the learning activities will depend on your current knowledge of this skill. You may like to engage in all of the activities or just a couple, it’s up to you!
Remember, learning takes time and effort. Invest your time, give your best effort and you will achieve great things!
Activity 1. Required knowledge skill check
These images show you the required knowledge for this skill. If you are super confident in your ability to answer these questions on number bonds and mental addition then you’re ready to move onto Activity 2. For more information (including answers to each question) just click on an image and you’ll be connected to the skill’s web page.
Activity 2. Introductory video
This video gives a detailed introduction to this skill. Watch the video in full or navigate to a section of interest using the timings below. The links provide you with quick access to screen shots of key information from the video. Refer to these as you complete the following activities as needed.
Intro (0:00)
Sample question (0:09)
Key information (0:36)
Examples (6:13)
Quick quiz (9:55)
Part a. Subtracting a Number 10 or Less
Activity 3a. Watch some more examples
The below video has step-by-step explanations for the first five practice skill questions. This is a great way to get started on the practice questions if you aren’t ready to try them on your own just yet.
Activity 4a. Complete and correct some practice questions
These questions are here so you can practice completing this skill on your own. The answers to these questions are included below. Check your answer after each question to make sure you are correctly carrying out the skill. Complete as many questions as you need to feel confident in your ability to carry out this skill on your own in future.
Part b. Subtracting a 1-digit Number from a 2-digit Number
Activity 3b. Watch some more examples
The below video has step-by-step explanations for the first five practice skill questions. This is a great way to get started on the practice questions if you aren’t ready to try them on your own just yet.
Activity 4b. Complete and correct some practice questions
These questions are here so you can practice completing this skill on your own. The answers to these questions are included below. Check your answer after each question to make sure you are correctly carrying out the skill. Complete as many questions as you need to feel confident in your ability to carry out this skill on your own in future.
Part c. Subtracting Numbers Using Take Away and Difference
Activity 3c. Watch some more examples
The below video has step-by-step explanations for the first five practice skill questions. This is a great way to get started on the practice questions if you aren’t ready to try them on your own just yet.
Activity 4c. Complete and correct some practice questions
These questions are here so you can practice completing this skill on your own. The answers to these questions are included below. Check your answer after each question to make sure you are correctly carrying out the skill. Complete as many questions as you need to feel confident in your ability to carry out this skill on your own in future.
Part d. Subtracting a 2-digit Number
Activity 3d. Watch some more examples
The below video has step-by-step explanations for the first five practice skill questions. This is a great way to get started on the practice questions if you aren’t ready to try them on your own just yet.
Activity 4d. Complete and correct some practice questions
These questions are here so you can practice completing this skill on your own. The answers to these questions are included below. Check your answer after each question to make sure you are correctly carrying out the skill. Complete as many questions as you need to feel confident in your ability to carry out this skill on your own in future.
Activity 5*. Final Quizzes
These quizzes are used to see if you have achieved the goal of being able to complete questions on these skills on your own. There are no answers provided as it is hoped that at this point you are so confident in your knowledge of these skills that you are certain that your answers are correct. If you need more information or practice on this skill to get to this level of confidence have a go (or another go) at the above activities.
*This activity should only be completed by students working in a parent led program or whose teacher has specifically asked them to complete this activity.
Quiz a.
Quiz b.
Quiz c.
Quiz d.
