Decimal Operations Flashcards

Grade 4 · Math · Flashcards

Study decimal place value, addition, subtraction, and comparison with these review cards.

Flashcards

Decimal point: The dot separating whole numbers from fractional parts; e.g., in 4.75, the dot is between 4 and 7
Tenths place: First digit to the right of the decimal; 0.3 = 3 tenths = 3/10
Hundredths place: Second digit to the right of the decimal; 0.07 = 7 hundredths = 7/100
Rule for adding decimals: Line up the decimal points, fill empty places with zeros, then add as with whole numbers
Rule for subtracting decimals: Line up decimal points, fill empty places with zeros, then subtract; regroup (borrow) as needed
Comparing decimals: Compare digit by digit from left to right; check tenths first, then hundredths
0.5 vs 0.50: Equal — trailing zeros after the last decimal digit do not change value
1.25 + 2.4: 3.65 — write 2.4 as 2.40, then add: 0.25 + 0.40 = 0.65 and 1 + 2 = 3
5.0 − 2.37: 2.63 — write 5.0 as 5.00; borrow to subtract hundredths and tenths
0.1 as a fraction: 1/10 — one tenth
0.25 as a fraction: 25/100 = 1/4 — one quarter
Is 0.6 greater than 0.59?: Yes — 0.6 = 0.60 = 60 hundredths; 0.59 = 59 hundredths; 60 > 59
Decimal place value connection to money: Tenths place = dimes, hundredths place = pennies; $2.35 = 2 dollars, 3 dimes, 5 pennies