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Process Math and Mental MathProcess Math and Mental Math
Model:
50 + 30 =
Steps:
1.think 30
2.add 5 tens¡­(5 fingers)
say 40, 50, 60, 70, 80
3.the answer is 80
Practice:
60 + 10 = _____
30 + 20 = _____
20 + 40 = _____
50 + 40 = _____
80
70
50
60
90
Model:
53 + 35 =
Steps:
1.think 35
2.add 3 ones¡­(hold up 3 fingers) 36,
37, 38
3.add the 5 tens¡­(hold up 5 fingers)
48, 58, 68, 78, 88
4.the answer is 88
Practice:
62 + 11 = _____
35 + 23 = _____
27 + 42 = _____
56 + 41 = _____
88
73
58
69
97
4 3 6 1 7 5
+ 2 1 + 1 7 + 2 2
4 1 6 0 3 4
+ 1 8 + 2 7 + 2 2
Model:
5 3
+ 3 3
Steps:
1.3 + 3 write answer for ones
2.3 + 5 write answer for tens
3.the answer is 86
68 46 87 79
95 78 65
Model:
60 - 30 =
Steps:
1.think 30
2.count difference by tens ¡­
say 40, 50, 60 (3 fingers = 30)
3.the answer is 30
Practice:
60 - 10 = _____
70 - 40 = _____
50 - 30 = _____
90 - 50 = _____
30
50
30
20
40
Model:
53 - 32 =
Steps:
1.Think 32
2.count difference of ones...
think 32, count to 33 (1 finger = 1)
3.count difference of tens¡­ think
33 count to 53 (2 fingers = 20)
4.the answer is 21
Practice:
62 + 11 = _____
35 + 23 = _____
27 + 42 = _____
56 + 41 = _____
21
73
58
69
97
4 3 7 7 7 5
- 2 3 - 1 2 - 2 4
4 8 6 7 7 7
- 2 1 - 3 0 - 2 4
Model:
5 3
- 3 3
Steps:
1.count difference of ones
count from 3 to 3 = 0
write 0 under ones
2.count difference of tens,
count from 3 to 5 = 2
write 2 under tens
3.the answer is 20
02
02 55 15
74 73 35
? Ones before Tens
? Add by tens (if zeros are in the ones places)
? Add by ones then tens
? Count difference by tens (if zeros are in the ones places)
? Count difference by ones then tens
? Try mental math first
? Use algorythm last

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Dbldigitmath

  • 1. Process Math and Mental MathProcess Math and Mental Math
  • 2. Model: 50 + 30 = Steps: 1.think 30 2.add 5 tens¡­(5 fingers) say 40, 50, 60, 70, 80 3.the answer is 80 Practice: 60 + 10 = _____ 30 + 20 = _____ 20 + 40 = _____ 50 + 40 = _____ 80 70 50 60 90
  • 3. Model: 53 + 35 = Steps: 1.think 35 2.add 3 ones¡­(hold up 3 fingers) 36, 37, 38 3.add the 5 tens¡­(hold up 5 fingers) 48, 58, 68, 78, 88 4.the answer is 88 Practice: 62 + 11 = _____ 35 + 23 = _____ 27 + 42 = _____ 56 + 41 = _____ 88 73 58 69 97
  • 4. 4 3 6 1 7 5 + 2 1 + 1 7 + 2 2 4 1 6 0 3 4 + 1 8 + 2 7 + 2 2 Model: 5 3 + 3 3 Steps: 1.3 + 3 write answer for ones 2.3 + 5 write answer for tens 3.the answer is 86 68 46 87 79 95 78 65
  • 5. Model: 60 - 30 = Steps: 1.think 30 2.count difference by tens ¡­ say 40, 50, 60 (3 fingers = 30) 3.the answer is 30 Practice: 60 - 10 = _____ 70 - 40 = _____ 50 - 30 = _____ 90 - 50 = _____ 30 50 30 20 40
  • 6. Model: 53 - 32 = Steps: 1.Think 32 2.count difference of ones... think 32, count to 33 (1 finger = 1) 3.count difference of tens¡­ think 33 count to 53 (2 fingers = 20) 4.the answer is 21 Practice: 62 + 11 = _____ 35 + 23 = _____ 27 + 42 = _____ 56 + 41 = _____ 21 73 58 69 97
  • 7. 4 3 7 7 7 5 - 2 3 - 1 2 - 2 4 4 8 6 7 7 7 - 2 1 - 3 0 - 2 4 Model: 5 3 - 3 3 Steps: 1.count difference of ones count from 3 to 3 = 0 write 0 under ones 2.count difference of tens, count from 3 to 5 = 2 write 2 under tens 3.the answer is 20 02 02 55 15 74 73 35
  • 8. ? Ones before Tens ? Add by tens (if zeros are in the ones places) ? Add by ones then tens ? Count difference by tens (if zeros are in the ones places) ? Count difference by ones then tens ? Try mental math first ? Use algorythm last