Mental Subtraction

Mental Subtraction

Mental Skills (page 70)

Mental Subtraction

When we subtract numbers mentally, we are trying to find a quick way of subtracting the numbers in our heads. Let us take a look at some examples.

Multiple Choice

Min wants to find the difference between 185 and 29.

• 154

• 155

• 156

• 157

Multiple Choice

What is 569 - 53?

• 515

• 516

• 517

• 518

Find Doubles and Halves Mentally

Multiplying and Dividing Mentally (page 72)

Open Ended

How do we find double 120 mentally?

Open Ended

How can we find half of 50 mentally?

page 74