= 16×(77+23)

= 16× 100

= 1600

(2)28×30+30×22

=30×(28+22)

=30×50

= 1500

(3)32×27+ 18×27

=27×(32+ 18)

=27×50

= 1350

(4) 125×64

= 125×8×8

= 1000×8

=8000

(5)76× 10 1

=76×( 100+ 1)

=76× 100+76× 1

=7600+76

=7676

(6)695- 134+ 105- 166

=(695+ 105)-( 134+ 166)

=800-300

=500

definition

Addition: the operation of combining two numbers into one number.

Subtraction: when two addends and one of them are known, the operation of finding the other addend.

Multiplication: the operation of finding the product of two numbers.

Division: the operation of finding another factor by knowing the product of two factors and one of them.