MENTAL MATH COMPLEMENTS OF NUMBERS WORKSHEET

Loop the complements in each set

Problem 1 :

Complements to 20. There are three to find. The first one has been done is shown. 

Solution

Problem 2 :

Complements of 50. There are 8 to find.

Solution

Problem 3 :

Solution

Problem 4 :

Solution

Problem 5 :

Show how knowing the complements to 20, 50 and 100 makes adding easier. You may want to loop the complements first. 

a) 80 + 20 + 15 + 5 = _____

b) 18 + 2 + 30 + 20 + 10 + 10 = ___

c) 25 + 25 + 40 + 30 + 20 + 10 = _____

d) 15 + 35 + 20 + 30 + 10 + 12 =  _____

Solution

Problem 6 :

Complete the complements of 50

Solution

Problem 7 :

Complete the complements of 100.

Solution