6
Decimal multiplication
0
59
0
Work out 14.2 x 9.3
100
0
1
132.06
Well done, you did 142 x 93 and then counted two decimal places back
1
100
1
13206
nope - once you have multiplied the numbers you need to move the decimal point back a total of two places
0
0
1
1320.6
nope - you need to move the decimal point back two places, one for the 14.2 and one for the 9.3
0
0
1
170.4
nope - looks like you forgot to put a zero down when you multiplied by the 9 in the tens column
0
0
1
0
0
1
3.142 x 16
100
0
1
50.272
Well done, you did 3142 x 16 and then moved the decimal point back three places
1
100
1
502.72
nope - move the decimal point back three places
0
0
1
219.94
nope - looks like you forgot to put a zero down when you multiplied by the 1 in the 16
0
0
1
34.072
nope - looks like you have made a mistake with the carries when you were multiplying by the 6 in the 16
0
0
1
0
0
1
17.5 x 45.25
100
0
1
791.875
Well done, you did 4525 x 175 and then counted a total of three decimal places back
1
100
1
79.1875
nope - you need to count 3 decimal places back, one place for the 17.5 and two places for the 45.25
0
0
1
384.625
nope - looks like you put 1 zero down instead of two zeros when multiplying by the 1 in 175
0
0
1
108.25
nope - looks like you forgot to put any zeros down when you were multiplying by the 7 and by the 1 in 175
0
0
1
0
0
1
Find 7.5 x 6.4
100
0
1
48
Well done, 75 x 64 then count back a total of two places
1
100
1
4800
nope - you need to count back two decimal places to make the answer the right size
0
0
1
750
nope - looks like you forgot to put a zero when you multipled by the 6 in 64
0
0
1
480
nope - you need to move the decimal point two places, one place for the 7.5 and one place for the 6.4
0
0
1
0
0
1
17.5 x 650
100
0
1
11375
Well done, you multiplied 650 by 175 and then counted back one place (or just multiplied 175 x 65)
1
100
1
1137.5
nope - you have to move the decimal point just once as there are no decimal points in the 650
0
0
1
113750
nope - you need to move the decimal point back one place
0
0
1
7380
nope - looks like you forgot to put a zero down when multiplying by the 7 in 175
0
0
1
0
0
1
Find 4.2 x 0.941
100
0
1
3.9522
Well done, you found 941 x 42 and then moved the decimal point back 4 places
1
100
1
5.646
nope - looks like you did not put a zero down when multiplying by the 4
0
0
1
39.522
nope - you have to move the decimal point a total of four places, one for the 4.2 and three for the 0.941
0
0
1
0.39522
nope - you have to move the decimal point a total of four places, one for the 4.2 and three for the 0.941
0
0
1
0
0
1
Find 3.5 x 92
100
0
1
322
Well done. I did this by finding 35 x 92 and then moving the dp back one place. You could add 92 three times then add half of 92!
1
100
1
32.2
nope - correct numbers but you only have to move the decimal point one place
0
0
1
736
nope - looks like you forgot to put a zero down when you multiplied by the 3 in 35
0
0
1
312
nope - check the carry when you multiply by the 3 in 35
0
0
1
0
0
1
14.25 x 6.7
100
0
1
95.475
Well done, 1425 x 67 and move the dp back 3 places
1
100
1
954.75
nope - count back 3 places, one for the 6.7 and two for the 14.25
0
0
1
185.25
nope - looks like you forgot to put a zero down when you multiplied by the 6 in 65
0
0
1
96.475
nope - looks like the adding went wrong!
0
0
1
0
0
1
0.05 x 12.56
100
0
1
0.628
Well done, you multiplied 1256 by 5 (or found half of 12560) and then moved the dp back four places
1
100
1
6.28
nope - the numbers are right but you need to move the decimal point back a total of 4 places, two for the 12.56 and two for the 0.05
0
0
1
0.682
nope - looks like you transposed the last two figures. If you transpose figures often, ask your tutor about it
0
0
1
0.528
nope - check your multiplying in the first decimal place, a carry seems to have got lost
0
0
1
0
0
1
1.25 x 6.85
100
0
1
8.5625
Well done, you did 685 x 125 and then moved the dp back 4 places
1
100
1
0.85625
nope - looks like you counted back too many decimal places, it should be 4 places, two for the 1.25 and two for the 6.85
0
0
1
85.625
nope - looks like you counted back too few decimal places, it should be 4 places, two for the 1.25 and two for the 6.85
0
0
1
54.8
nope - you need to add zeros when multiplying by the 10s and 100s column
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0
1
0
0
1
0
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