Using Doubles in Math

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Published on November 16, 2007

Author: Edolf

Source: authorstream.com

Using Doubles in Math:  Using Doubles in Math 1 + 1= 2:  1 + 1= 2 One dog plus one more dog equals two dogs in all. How many dogs would I have if I added 3 more dogs? Click to see answer 1 + 1 + 1 +1 + 1 = 5:  1 + 1 + 1 +1 + 1 = 5 Next Problem 2 + 2 = 4:  2 + 2 = 4 Two feet plus two feet equals four feet in all. How many feet would I have if there were 3 more disks? Click to see answer 2 + 2 + 2 + 2 + 2 = 10:  2 + 2 + 2 + 2 + 2 = 10 Next Problem 3 + 3 = 6:  3 + 3 = 6 Three wheels plus three wheels equals six wheels in all. How many wheels would I have if I added one more tricycle? Click to see answer 3 + 3 + 3 = 9:  3 + 3 + 3 = 9 Next Problem 4 + 4 = 8:  4 + 4 = 8 Four legs plus four legs equal eight legs altogether How many elephant legs would there be if you had 4 elephants? Click to see answer 4 + 4 + 4 + 4= 16:  4 + 4 + 4 + 4= 16 4 elephants with 4 legs each equals 16 legs Next problem 5 + 5 = 10:  5 + 5 = 10 Five fingers plus five fingers is ten fingers in all Click to see answer How many fingers would there be if you saw 5 hands? 5 + 5 + 5 + 5 + 5 = 25:  5 + 5 + 5 + 5 + 5 = 25 Count by 5’s to find the answer the easy way 5 10 15 20 25 Next Problem 6 + 6 = 12:  6 + 6 = 12 Six cans of pop plus six cans of pop is twelve cans of pop in all Click to see answer How many cans of pop would there be if you added 6 more cans? 6 + 6 + 6 = 18:  6 + 6 + 6 = 18 Next Problem 7 + 7 = 14:  7 + 7 = 14 Seven aliens plus seven more equals fourteen aliens in all Click to see answer How many aliens would there be if one more showed up? 7 + 7 + 1 = 15:  7 + 7 + 1 = 15 Next Problem 8 + 8 = 16:  8 + 8 = 16 8 pencils and 8 pencils is a total of 16 pencils Click to see answer How many pencils would I have if I received 2 more? 8 + 8 + 2 = 18:  8 + 8 + 2 = 18 Next Problem 9 + 9 = 18:  9 + 9 = 18 Nine dice plus nine more dice is equal to eighteen dice. Click to see answer How many dice would I have if I took 9 dice away? 18 – 9 = 9:  18 – 9 = 9 Next problem 10 + 10 = 20:  10 + 10 = 20 Ten jewels plus ten more jewels equals twenty jewels in all. A jewel thief takes two jewels. How many are left now? Click to see answer 20 - 2 = 18:  20 - 2 = 18 Click to review your math facts How fast can you say the answers?:  How fast can you say the answers? Doubles 2 + 2 = 4+4 = 8+8= 1+1= 9+9= 3+3= 5+5= 6+6= 4+4= 10+10= 1+1= 7+7= 6+6= 4+4= 2+2= Standards Addressed:  Standards Addressed Benchmark 4 - Computation The student will… (1) 4.4.01 use manipulatives to demonstrate joining, separating, and the inverse operation of addition and subtraction of sets through 18. (1) 4.4.02 ▲ N demonstrate addition and subtraction fact strategies, including the following:         a.    addition: doubles, doubles + 1, counting on, make a ten, relation between addition and subtraction.  

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