Decimals

•When you multiply, the number gets bigger, hence decimal place shifts to the right.

•3.49 x 1000 = 3490

*An easy way to check your answer is use estimation àto round off the decimal to the whole number and multiply

à 3 x 1000 = 3000. Hence, answer should be about 3000.

•When you divide, the number gets smaller, hence decimal place shifts to the left.

•2580 ÷ 1000 = 2.58

*An easy way to check your answer is use estimation

à 2000 ÷ 1000 = 2. Hence, answer should  be about 2.

Try!

•2.48 x 30 = _____________   

2.48 x 30 = 2.48 x 3 x 10 = 7.44 x 10 = 74.4

Ans: 74.4

•468 ÷ 2000 = ____________

468 ÷ 2000 = 468 ÷ 2 ÷ 1000 = 234 ÷ 1000 = 0.234

Ans: 0.234

•4.68 x 200 = ______ x 100

4.68 x 200 = (4.68 x 2) x 100 = 9.36 x 100

Ans: 9.36

•4.68 x 200 = ______ x 10

4.68 x 200 = (4.68 x 20) x 10 = 93.6 x 100

Ans: 93.6