Page 51 - TB_5B
P. 51
Activity 1 Multiplying Whole Numbers by Decimals
Learn how to multiply whole numbers by decimals.
Multiply. 3 Relate multiplication of decimals to repeated addition. This can be
0.7 shown using a number line. Have students fill in the blanks to find
the products.
0.7 0.7 0.7
0 0.5 1 1.5 2 2.5
2 .1
3 0.7 = 0.7 + 0.7 + 0.7 = 2.1
1 . Use a number line to multiply.
a. b.
0 0.5 1 0 0.5 1 1.5 2
3 0.3 = + + 4 0.4 = + + +
= 4 0.4 =
2 . Multiply. b. 0.6 Add the number of decimal digits
8
a. 0.5 in each factor to place the decimal
5 d. 2 0.6
point in the product.
c. 0.8 4
0.6 1 decimal digit
4 0 decimal digit
2.4 1 decimal digit
e. 3 0.9 f. 0.5 7
40
Learn how to multiply whole numbers by decimals.
Multiply. 3 Relate multiplication of decimals to repeated addition. This can be
0.7 shown using a number line. Have students fill in the blanks to find
the products.
0.7 0.7 0.7
0 0.5 1 1.5 2 2.5
2 .1
3 0.7 = 0.7 + 0.7 + 0.7 = 2.1
1 . Use a number line to multiply.
a. b.
0 0.5 1 0 0.5 1 1.5 2
3 0.3 = + + 4 0.4 = + + +
= 4 0.4 =
2 . Multiply. b. 0.6 Add the number of decimal digits
8
a. 0.5 in each factor to place the decimal
5 d. 2 0.6
point in the product.
c. 0.8 4
0.6 1 decimal digit
4 0 decimal digit
2.4 1 decimal digit
e. 3 0.9 f. 0.5 7
40
