Happy New Year families!
We will be wrapping up the Addition and Subtraction unit in a few days and beginning our Multiplying and Dividing unit. With that, comes the practice of new mental math facts.
Facts should be practiced one group at a time, in this order, with these strategies in mind:
REMEMBER to do a "slide sort" every so often so they facts aren't perfectly in order all the time :)
Grade 3: Fact practice up to 5x5 (multiplication & division)
Grade 4: Fact practice up to 9x9 (multiplication & division)
We will be wrapping up the Addition and Subtraction unit in a few days and beginning our Multiplying and Dividing unit. With that, comes the practice of new mental math facts.
Facts should be practiced one group at a time, in this order, with these strategies in mind:
- "Doubles" - x2 Facts, relating them to doubles in addition.
- "Nifty Nines" - x9 Facts, looking at patterns in the answers: the tens digit is one less than the variable factor and the two digits sum to 9; or finding the product using 10 instead of nine and subtracting the extras. Ex: 4x9 - 1 less than 4 is 3; 3+6 =9; the answer is 36.
- "Fives Facts" - x5, use the connection to the minute hand on a standard clock. Also, using two patterns: (A) products of even factors and 5 end in 0 and the tens digit is half the even factor. Ex: 4x5=20 (half of 4 is 2) (B) the product of odd factors and 5 end in 5 and the tens digit is half the number before the odd factor. Ex: 7x5=35 (half of 6 is 3)
- Ones Facts - using the connection to the meaning, ex: 6x1 = 1+1+1+1+1+1, 1x6 means "one 6"
- "Tricky Zeros" - using the connections to meaning to stress why all the results are zero. ex: 6x0 means "6 zeros" or "six sets of nothing" or 0+0+0+0+0+0. 0x6 is harder to conceptualize. Ask your child to draw 2 sets of 6, then 1 set of 6, then 0 sets of 6, where they won't draw anything at all - they will realize why zero is the result.
- Threes Facts - using the "double plus one more" strategy. Ex: 3x7 - think: 2x7 plus one more set of 7. This will require practice!
- Fours Facts - use the "double-double" strategy. Ex: 4x7 - think: 2x7 = 14, and 2x7 =14 so 14+14= 28. This will require practice!
- The Last Nine - using decomposition and helping fact strategies. Ex: 7x6 - think: 5 sets of 6 to get 30, plus two sets of 6 to get 12; added together makes 42. This will require practice!
REMEMBER to do a "slide sort" every so often so they facts aren't perfectly in order all the time :)
Grade 3: Fact practice up to 5x5 (multiplication & division)
Grade 4: Fact practice up to 9x9 (multiplication & division)
x0 Facts |
x 1 Facts |
x 2 Facts |
x 3 Facts |
x 4 Facts |
x 5 Facts |
x 6 Facts |
x 7 Facts |
x 8 Facts |
x 9 Facts |
Mixed 0 + 1 Facts |
Mixed Facts: 1_1_2_5_9_10.ppt |
Mixed 2_10 Facts.ppt |
Mixed _3_4_9_11 Facts.ppt |
Mixed_4_5_6 Facts.ppt |
Mixed_5_9 Facts.ppt |
Mixed_6_7 Facts.ppt |
Doubles Multiplication Facts.ppt |