Mental Math Grade 6 Teacher's Guide

d) For, 0.4 × 0.01, think, “The 4 tenths will decrease two places to 4
thousandths, therefore the answer is 0.004.”
e) For 5 × 0.001, think, “The 5 ones will decrease three places to 5
thousandths; so, the answer is 0.005.”
Practice Items
6 × 0.1 = 8 × 0.1 = 3 × 0.1 =
9 × 0.1 = 1 × 0.1 = 12 × 0.1 =
72 × 0.1 = 136 × 0.1 = 406 × 0.1 =
0.7 × 0.1 = 0.5 × 0.1 = 0.1 × 10 =
1.6 × 0.1 = 0.1 × 84 = 0.1 × 3.2 =
6 × 0.01 = 8 × 0.01 = 1.2 × 0.01 =
0.5 × 0.01 = 0.4 × 0.01 = 0.7 × 0.01 =
2.3 × 0.01 = 3.9 × 0.01 = 10 × 0.01 =
100 × 0.01 = 330 × 0.01 = 46 × 0.01 =
3 × 0.001 = 7 × 0.001 = 80 × 0.001 =
21 × 0.001 = 45 × 0.001 = 12 × 0.001 =
62 × 0.001 = 9 × 0.001 = 75 × 0.001 =
4mm =_____m 9mm = _____m 6m = ______km
Add your own practice items
• Dividing by 0.1, 0.01and 0.001 Using a Place-Value-Change
Strategy (New)
All the place values of the number being
divided increase one place when dividing by
0.1, two places when dividing by 0.01 and three
places when dividing by 0.001.
By exploring the patterns that result when numbers are divided by decimal
tenths, hundredths and thousandths, students will see that all the place
values of the number being divided increase one place when dividing by 0.1,
two places when dividing by 0.01 and three places when dividing by 0.001.
40 Mental Math – Grade 6