Grade 5 Math Riddle: A Handy Number

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Engaging algebra puzzle for 5th graders

Créé par

Sheilla Atambo

Saudi Arabia

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Grade 5 Math Riddle: A Handy NumberVersion en ligne Engaging algebra puzzle for 5th graders par Sheilla Atambo 1 I am a number. If you double me and then add six, I become twenty. What number am I? Hints 1 (20 - 6) ÷ 2 equals the unknown number. 2 Subtract 6 from 20, then divide by 2. 3 Think about the operations in reverse: undo the addition first. 2 Riddle 1: I am a number. I am 3 more than 7. What number am I? Hints 1 Write the equation 7 + 3 and solve it. 2 Use simple addition facts you know from counting. 3 Think about adding three to seven. 3 Riddle 2: I am twice a number and then I add 6; the result is 26. What number am I? Hints 1 Solve for x by undoing the operations. 2 Form the equation: 2x + 6 = 26. 3 Let the unknown number be x. 4 Riddle 3: I am a four-digit number. The thousands digit is 3 and the tens digit is 5; all other digits are 0. What number am I? Hints 1 Fill in hundreds as 0 and ones as 0: 3050. 2 Only the thousands and tens places have nonzero digits. 3 Think about place value: thousands, hundreds, tens, ones. 5 Riddle 4: If you have 1/2 of a pizza plus 1/3 of another pizza, how much pizza is that in fractions? Hints 1 Compute: 3/6 + 2/6 = 5/6. 2 Add the fractions after getting a common denominator (6). 3 Find a common denominator for 1/2 and 1/3. 6 Riddle 5: Round the number 23.678 to the nearest tenth. What is it? Hints 1 Check: 23.6 rounds to 23.6; 23.66 rounds to 23.7. 2 If the hundredths digit is 5 or more, round up. 3 Look at the hundredths place to decide rounding.

Grade 5 Math Riddle: A Handy NumberVersion en ligne

Engaging algebra puzzle for 5th graders

par Sheilla Atambo

I am a number. If you double me and then add six, I become twenty. What number am I?

Hints

(20 - 6) ÷ 2 equals the unknown number.

Subtract 6 from 20, then divide by 2.

Think about the operations in reverse: undo the addition first.

Riddle 1: I am a number. I am 3 more than 7. What number am I?

Hints

Write the equation 7 + 3 and solve it.

Use simple addition facts you know from counting.

Think about adding three to seven.

Riddle 2: I am twice a number and then I add 6; the result is 26. What number am I?

Hints

Solve for x by undoing the operations.

Form the equation: 2x + 6 = 26.

Let the unknown number be x.

Riddle 3: I am a four-digit number. The thousands digit is 3 and the tens digit is 5; all other digits are 0. What number am I?

Hints

Fill in hundreds as 0 and ones as 0: 3050.

Only the thousands and tens places have nonzero digits.

Think about place value: thousands, hundreds, tens, ones.

Riddle 4: If you have 1/2 of a pizza plus 1/3 of another pizza, how much pizza is that in fractions?

Hints

Compute: 3/6 + 2/6 = 5/6.

Add the fractions after getting a common denominator (6).

Find a common denominator for 1/2 and 1/3.

Riddle 5: Round the number 23.678 to the nearest tenth. What is it?

Hints

Check: 23.6 rounds to 23.6; 23.66 rounds to 23.7.

If the hundredths digit is 5 or more, round up.

Look at the hundredths place to decide rounding.

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Grade 5 Math Riddle: A Handy Number

Devinette

À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

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Grade 5 Math Riddle: A Handy NumberVersion en ligne

par Sheilla Atambo

I am a number. If you double me and then add six, I become twenty. What number am I?

Hints

Riddle 1: I am a number. I am 3 more than 7. What number am I?

Hints

Riddle 2: I am twice a number and then I add 6; the result is 26. What number am I?

Hints

Riddle 3: I am a four-digit number. The thousands digit is 3 and the tens digit is 5; all other digits are 0. What number am I?

Hints

Riddle 4: If you have 1/2 of a pizza plus 1/3 of another pizza, how much pizza is that in fractions?

Hints

Riddle 5: Round the number 23.678 to the nearest tenth. What is it?

Hints

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