Multiplication and Place Value Partitioning

Problems	Strategy	Answer
1.85 x 90=	85 x 90= 90 x 90=8100 5 x 90=450 8100 - 450= 8100 - 450=7650	7650
2.79 x 89=	79 x 89= 80 x 89=7120 1 x 89=89 7120 - 89= 7120 - 80=7040 7040 - 9=7031	7031
3.68 x 76=	68 x 76= 70 x 76=5320 2 x 76=152 5320 - 152= 5320 - 150=5170 5170 - 2=5168	5168
4.92 x 88=	92 x 88= 100 x 88=8800 8 x 88=704 8800 - 704= 8800 - 700=8100 8100 - 4=8096	8096
5.59 x 67=	59 x 67= 60 x 67=4020 1 x 67=67 4020 - 67= 4020 - 60=3960 3960 - 7=3953	3953

Multiplication 5

Problems	Strategy	Answer
1.85 x 90=	85 x 90= 90 x 90=8100 5 x 90=450 8100 - 450= 8100 - 450=7650	7650
2.79 x 89=	79 x 89= 80 x 89=7120 1 x 89=89 7120 - 89= 7120 - 80=7040 7040 - 9=7031	7031
3.68 x 76=	68 x 76= 70 x 76=5320 2 x 76=152 5320 - 152= 5320 - 150=5170 5170 - 2=5168	5168
4.92 x 88=	92 x 88= 100 x 88=8800 8 x 88=704 8800 - 704= 8800 - 700=8100 8100 - 4=8096	8096
5.59 x 67=	59 x 67= 60 x 67=4020 1 x 67=67 4020 - 67= 4020 - 60=3960 3960 - 7=3953	3953

Multiplication 1

Problems	Strategies	Answer
1.67 x 9=	67 x 9= 70 x 9=630 3 x 9=27 630 - 27= 630 - 20=610 610  - 7=603	603
2.92 x 8=	92 x 8= 100 x 8=800 8 x 8=64 800 - 60=720 720 - 4=716	716
3.121 x 7	121 x 7= 130 x 7=910 9 x 7=63 910 - 63= 910 - 60=850 850 - 3=847	847
4.175 x 6	175 x 6= 180 x 6=1080 5 x 6=30 1080-30= 1080-30=1050	1050
5.215 x 7	215 x 7= 220 x 7=1540 5 x 7=35 1540 - 30=1510 1510 - 5=1505	1505

Multiplicaton 2

MULTIPLICATION

Problems	Strategies	Answer
1.37 x 9=	37 x 9= 40 x 9=360 3 x 9=27 360 - 27= 360 - 20=340 340 - 7=333	333
2.47 x 15=	47 x 15= 50 x 15=750 3 x 15=45 750 - 45= 750 - 40=710 710 - 5=705	705
3.65 x 7=	65 x 7= 70 x 7=490 5 x 7=35 490 - 35= 490  - 30=460 460 - 5=455	455
4.81 x 9=	81 x 9= 90 x 9=810 9 x 9=81 810 - 81= 810 - 80=730 730 - 1=729	729
5.72 x 17=	72 x 17= 80 x 17=1360 8 x 17=136 1360 - 136= 1360 - 130=1230 1230 - 6=1224	1224
6.39 x 12=	39 x 12= 40 x 12=480 1 x 12=12 480 - 12= 480 - 10=470 470 - 2=468	468
7.187 x 9=	187 x 9= 190 x 9=1710 3 x 9=27 1710 - 27= 1710 - 20=1690 1690 - 7=1683	1683
8.77 x 33=	77 x 33= 80 x 33=2640 3 x 33=99 2640 - 99= 2640 - 90=2550 2550 - 9=2541	2541

Multiplication 3

Problems	Strategies	Answer
1.57 x 19=	57 x 19= 50 x 19= 7 x 19= 50 x 10=500 50 x 9=450 7 x 10=70 7 x 9=63	500 450 70 63 + ------- 1083
2.37 x 17=	37 x 17= 30 x 17= 7 x 17= 30 x 10=300 30 x 7=210 7 x 10=70 7 x 7=49	300 210 70 49 + ------- 629
3.46 x 12=	46 x 12= 40 x 12= 6 x 12= 40 x 10=400 40 x 2=80 6 x 10=60 6 x 2=12	400 80 60 12 + ------- 552
4.83 x 13=	83 x 13= 80 x 13= 3 x 13= 80 x 10=800 80 x 3=240 3 x 10=30 3 x 3=9	800 240 30 9 + ------- 1079
5.67 x 16=	67 x 16= 60 x 16= 7 x 16= 60 x 10=600 60 x 6=360 7 x 10=70 7 x 6=42	600 360 70 42 + ------- 1072