- Mari mengerjakan soal berikut menggunakan gabungan sifat komutatif dan asosiatif.
1) 59 + 38 + 51 = 59 + 51 + 38
= (59 + 51) + 38
= 110 + 38
= 148
2) 30 + 90 + 70 = 30 + 70 + 90
= (30 + 70) + 90
= 100 + 90
= 190
3) 160 + 25 + 40 = 160 + 40 + 25
= (160 + 40) + 25
= 200 + 25
= 225
4) 250 + 500 + 750 = 59 + 51 + 38
= (59 + 51) + 38
= 110 + 38
= 148
5) 336 + 789 + 664 = 336 + 664 + 789
= (336 + 664) + 789
= 1000 + 789 = 1789
- Mari mengerjakan soal berikut menggunakan sifat distributif.1. (45 × 26) + (45 × 74) = 45 x (26 + 74)= 45 x 100 = 45002. (23 × 19) – (23 × 9) = 23 x (19 – 9)= 23 x 10 = 2303. (36 × 27) + (64 × 27) = 27 x (36 + 64)= 27 x 100 = 27004. 69 × 1.001 = (69 x 1000) + (69 x 1)= 69000 + 69 = 690695. 125 × 18 = (125 x 10) + (125 x 8)= 1250 + 1000 = 2250
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