ROUNDING APPROXIMATIONS LESSON 2 ROUNDING NUMBERS DECIMAL PLACES

ROUNDING & APPROXIMATIONS: LESSON 2 ROUNDING NUMBERS (DECIMAL PLACES)

ROUNDING TO THE NEAREST 1000 127631 TH Rounded (Less Precise) H T U 000

ROUNDING TO THE NEAREST 1000 12 7631 TH Rounded (Less Precise) H T U 000

ROUNDING TO THE NEAREST 1000 127631 TH Rounded (Less Precise) H T U 12? 000 keep zero

1 2 77 6 3 1 +1 1 2? 0 0 0 same

1 2 77 6 3 1 +1 1 2 000 same

127631 +1 1 27000 same ROUND DOWN

1 27 6 3 1 +1 same 8 1 2? 0 0 0 7 ROUND DOWN

1 27 6 3 1 +1 same 8 ROUND UP 1 2? 0 0 0 7 ROUND DOWN

1 27 6 3 1 +1 same 8 1 2? 0 0 0 7 Smaller than 5 (0, 1, 2, 3, 4)

1 27 6 3 1 +1 same 8 1 2? 0 0 0 7 Smaller than 5 (0, 1, 2, 3, 4)

1 27 6 3 1 +1 same 5 or Greater (5, 6, 7, 8, 9) 8 1 2? 0 0 0 7 Smaller than 5 (0, 1, 2, 3, 4)

1 27 6 3 1 +1 8 5 or Greater (5, 6, 7, 8, 9) 1 2? 0 0 0

1 27 6 3 1 1 28000

WHY ROUND NUMBERS? - Sometimes we need to make Quick Calculations 700 + 200 Is easier to work than 728 + 199 - Don’t need very much Precision 59. 2 kg is better than 59. 1782123859 kg

WHY ROUND NUMBERS? - Recurring Decimals sometimes are better rounded up. 1. 3 = 1. 333333333 = 1. 3 - Irrational Numbers sometimes are better rounded up.

TH H T U 1 st Decimal Place DECIMAL POINT 2 nd d. p 3 rd d. p s nd th te th n ou sa nd t ou sa th ed th nd r hu te WHOLE NUMBER nt hs s hs DECIMAL NUMBER PLACES 4 th d. p

ROUNDING TO DECIMAL PLACES 5 8 4. 1 7 3 WHOLE Round to the nearest whole:

ROUNDING TO DECIMAL PLACES 00 70 3 5 8 4. 1 WHOLE Round to the nearest whole: Ans: 584. 000 = 584

ROUNDING TO DECIMAL PLACES 5 8 4. 1 7 3 1 st d. p. Round to the 1 st decimal place:

ROUNDING TO DECIMAL PLACES 20 70 3 5 8 4. 1 1 st d. p. Ans: 584. 200 = 584. 2 (1 d. p) Round to the 1 st decimal place:

ROUNDING TO DECIMAL PLACES 5 8 4. 1 7 3 2 nd d. p. Round to the 2 nd decimal place:

ROUNDING TO DECIMAL PLACES 3 5 8 4. 1 7 0 2 nd d. p. Ans: 584. 170 = 584. 17 (2 d. p) Round to the 2 nd decimal place:

REMEMBER WHOLE NUMBER 1 st Decimal Place 2 nd d. p 3 rd d. p 4 th d. p