Do the 2 x 50 first. Get 100. Multiply that by 14.
Move the decimal point two spaces to the right.
Multiply by ten and add one of the number. 7 x 11 = 70 + 7 23 x 11 = 230 + 23 = 253.
mentally solve whole number multiplication and division problems using: ... Dividing by 8 is like dividing by 2 then 2 then 2 so half 136 is 68 and half 68 is 34 and ... The following questions can be used to elicit discussion about the strategy
Rational?
Ooop
Assuming you meant 6 x 198... Do a mental sum for 6 x 200 (1200) then subtract 6 x 2 (12) to give you 1188.
You can do lattice, or do it mentally
Do the 2 x 50 first. Get 100. Multiply that by 14.
Move the decimal point two spaces to the right.
198 = (200 - 2) so use 6*200 - 6*2
Multiply the number by itself: 2x2=4, 3x3=9 and so on.
Multiply by ten and add one of the number. 7 x 11 = 70 + 7 23 x 11 = 230 + 23 = 253.
Ramone had a well-researched strategy. Having a strategy is important. Ted used a time-tested strategy. The strategy is to stay on course.
de-centralized strategy
You need to multiply 300m by 100cm since there are 100cm in a meter. You should be able to solve that mentally.
The Blitzkrieg Strategy.