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ADDING UP
CATEGORY 1
Adding Up strategy :The whole number is a multiple of ten or one hundred.The subtrahend is close to a multiple of ten or a landmark number.
20 – 1520 – 1420 – 920 – 8
30 – 2430 – 1930 – 1530 – 12
40 – 3440 – 2940 – 2440 – 19
50 – 4450 – 3950 – 2950 – 24
60 – 5460 – 4960 – 3960 – 29
70 – 5970 – 4970 – 3970 – 34
80 – 6980 – 5980 – 4980 – 39
90 – 7990 – 7490 – 4990 – 44
100 – 89100 – 74100 – 49100 – 44
CATEGORY 2
Adding Up strategy :The whole number is a multiple of ten or one hundred.The subtrahend is close to a multiple of ten or a landmark number.
100 – 89100 – 69100 – 49100 – 37
150 – 124150 – 149150 – 124150 – 99
250 – 224250 – 219200 – 199200 – 149
300 – 269300 – 249300 – 99
300 – 149
400 – 349400 – 299400 – 274200 – 199
500 – 449500 – 419500 – 299500 – 249
750 – 709750 – 599750 – 449750 – 324
1000 – 8991000 – 7491000 – 6241000 – 499
CATEGORY 3
Adding Up strategy :The whole number is NO longer an exact multiple of ten or one hundred.The subtrahend is farther distance from the whole.
50 – 2950 – 2950 – 4850 – 37
80 – 5984 – 5981 – 4881 – 36
70 – 4973 – 4976 – 6776 – 39
100 – 75120 – 75125 – 75125– 83
100 – 80140 – 80146 – 80146– 89
200 – 149250 – 149223 – 186245– 198
300 – 174315 – 174335 – 219335– 287
400 – 329420 – 329423 – 318444 – 298
500 – 249525 – 249
1000 – 4991000 – 671