counting on addition 2737475767 +10 27+40 = example: 67
TRANSCRIPT
Counting on Addition
27 37 47 57 67
+10 +10 +10 +10
27+40 =
Example:
67
2-digit number with a multiple of ten
Addition
27
20 7
20 40
Example:
67
27 + 40 =
7++
+= 60
=
2-digit number with a multiple of ten
Addition
53
50 3
50 80
Example:
133
53 + 80 =
3++
+= 130
=
2-digit number with a multiple of ten
Addition
97
90 7
90 80
Example:
177
97 + 80 =
7++
+= 170
=
Siti bought the items listed below.
Quantity Items The cost of one unit
Total
4 25
Story booksRulersPencil
sharpeners
$4$2$3
______________________________
Total amount
Practical Application$2 each
$3 each Siti paid the shopkeeper $100.00. How much change will she receive?
=___________
$4 each
• Add $16 + $4 + $15 =
2-digit number with a multiple of ten
$10 $6
$10 $5
$10 + $6 + $4 + $10 + $5
10
+10
20 6 7 8 9 10
+1 +1 +1 +1
= $20 + $10 +
= $35
$5
What is the total cost of two toy cars below?
B$447 $530
$447 = $400 + $40 + $7
$530 = $500 + $30
$447 + $530 = $400 + $500 + $40 + $30 +
= $ 900 + $70 +
$7
= B$977