9.3 Complements
9.3 Complements
Exercise 9.3
blank complement
Focus
1
Which complements for 100 are shown on the blank 100 squares?
Write the matching number sentences.
a
+
= 100
103
Original material © Cambridge University Press 2021. This material is not final and is subject to further changes prior to publication.
9 More addition and subtraction
b
+
2
= 100
What are the six complements for 1000, using multiples of 100?
Practice
3
Find the complement of 100 for each number.
Write your answer in the matching square of the grid.
19
82
93
46
78
37
3
51
64
complement
of 100
104
Original material © Cambridge University Press 2021. This material is not final and is subject to further changes prior to publication.
9.3 Complements
4
Use the complements that you found in question 3 to
write nine number sentences that have a total of 100.
+
= 100
+
= 100
+
= 100
+
= 100
+
= 100
+
= 100
+
= 100
+
= 100
+
= 100
5
Find all the pairs of numbers with 5 tens that are
complements for 1000.
6
Complete Ibrahim’s estimates. Remember to calculate
to find the estimates.
a
410 + 240 =
b
720 + 180 =
c
940 – 340 =
d
530 – 270 =
Challenge
7
Use complements of 100 to help you solve these problems.
a
There are 100 books on the bookshelf.
23 are borrowed.
How many books are left on the shelf?
b
Liling has 100 marbles.
She lost 17 of them.
How many marbles does she have left?
105
Original material © Cambridge University Press 2021. This material is not final and is subject to further changes prior to publication.