Mental Math Grade 6 Teacher's Guide
Mental Math Grade 6 Teacher's Guide
Mental Math Grade 6 Teacher's Guide
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4.2 + 3.5 = 6.3 + 1.6 = 4.2 + 3.7 =<br />
6.1 + 2.8 = 0.32 + 0.56 = 2.08 + 3.2 =<br />
4.15 + 3.22 = 5.43 + 2.26 = 6.03 + 2.45 =<br />
15.45 + 1.25 = 43.30 + 7.49 = 70.32 + 9.12 =<br />
Add your own practice items<br />
• Finding Compatibles (Review)<br />
This strategy for addition involves looking for pairs of numbers that<br />
combine to make a sum that will be easy to work with. Some examples<br />
of common compatible numbers include 1 and 9; 40 and 60; 75 and 25<br />
and 300 and 700.<br />
Examples<br />
a) For 3 + 8 + 7 + 6 + 2, think,“3 + 7 is 10, 8 + 2 is 10, so 10 + 10 + 6 is 26.”<br />
b) For 25 + 47 + 75, think, “25 and 75 is 100, so 100 and 47 is 147.”<br />
c) For 400 + 720 + 600, think, “400 and 600 is 1000, so the sum is 1720.”<br />
d) For 3000 + 7000 + 2400, think, “3000 and 7000 is 10 000, so 10 000<br />
and 2400 is 12 400.”<br />
Practice Items<br />
11 + 59 = 60 + 30 + 40 =<br />
75 + 95 + 25 = 475 + 25 =<br />
625 + 75 = 300 + 437 + 700 =<br />
800 + 740 + 200 = 900 + 100 + 485 =<br />
400 + 1600 + 3000 = 9000 + 3300 + 1000=<br />
3250 + 3000 + 1750 = 2200 + 2800 + 600 =<br />
3000 + 300 + 700 + 2000 = 3400 + 5600 =<br />
0.6 + 0.9 + 0.4 + 0.1 = 0.2 + 0.4 + 0.8 +=<br />
0.7 + 0.1 + 0.9 + 0.3 = 0.25 + 0.50 + 0.75 =<br />
0.4 + 0.5 + 0.6 + 0.2 + 0.5 = 0.45 + 0.63 = 0.80 + 0.26 =<br />
Add your own practice items<br />
<strong>Mental</strong> <strong>Math</strong> – <strong>Grade</strong> 6 29