Page 28 - SK Year 5 Mathematics DLP

2

invitation card name card poster
980 pieces 2 350 pieces 145 920 pieces

Based on the information above, total up the number of the three
printed materials.
Start by adding
980 + 2 350 + 145 920 = digits that make
10 or digits that
Method 1 Method 2 are the same.

2 1
1 1 1 9 8 0
9 8 0 3 3 3 0 2 3 5 0
+ 2 3 5 0 + 1 4 5 9 2 0 + 1 4 5 9 2 0
3 3 3 0 1 4 9 2 5 0 1 4 9 2 5 0

980 + 2 350 + 145 920 = 149 250
The total number of the three printed materials is 149 250 pieces.

3 745 + 1 903 + 35 298 + 895 575 =

Round off numbers to Estimate the Then, calculate
the nearest hundred. answer first. the actual answer.
745 700 1 1 2 1 1 2 2 2

1 903 1 900 7 0 0 7 4 5
1 9 0 0 1 9 0 3
35 298 35 300
3 5 3 0 0 3 5 2 9 8
895 575 895 600
+ 8 9 5 6 0 0 + 8 9 5 5 7 5
9 3 3 5 0 0 9 3 3 5 2 1

933 521 is nearer to 933 500. The answer is reasonable.

745 + 1 903 + 35 298 + 895 575 = 933 521

20 • Provide more exercises to reinforce the quick calculation skills by
1.6.1 adding up the numbers that make 10 or digits that are the same
first.