Number Counting And Arithmetic Worksheets - Unit 1 Page 32
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40unit 1despre(1-40)
10/28/11
8:10 AM
Page 32
Numbers
Unit 1
Know your number facts
Similarly, you should know pair of numbers which add up to 5.
Sum of 5
1+4=5
2+3=5
3+2=5
4+1=5
Pairs of numbers which add up to 10 are also useful.
Sum of 10
1+9=10
6+4=10
2+8=10
7+3=10
3+7=10
8+2=10
4+6=10
9+1=10
5+5=10
Two-stage addition
We can add two numbers using the doubles.
Example 1:
5 + 6 =
5 + 5 + 1
=
10 + 1 = 11
Example 2:
7 + 8 =
7 + 7 + 1
=
14 + 1
2.
Workout the following addition in two stages.
(a)
6 + 7
(b)
8 + 9
(c)
5 + 7
32
Thirty two
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