Clara forms one big triangle made up of identical little triangles. She has already put some triangles together (see diagram). What is the minimum number of little triangles she has to add?

• 5

• 9

• 12

• 15

Tags

CCSS.1.G.A.2

Find the product of 1533 and 33

• 45999

• 50399

• 50589

• 46549

Tags

CCSS.4.NBT.B.5

The board beside is formed by little white and dark squares. After a ninety-degree turn, how can this board appear?

• 
• 
• 
• 

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

The sum of these is not a square number

• 65 + 16

• 79 + 65

• 96 + 36

• 89 + 107

Tags

CCSS.4.NBT.B.4

Robert makes 5 statements. One of which is wrong. Which statement is wrong?

(A) My son Basil has 3 sisters.

(B) My daughter Ann has 2 brothers.

(C) My daughter Ann has 2 sisters.

(D) My son Basil has 2 brothers.

(E) I have 5 children.

Which statement is wrong?

• Statement A

• Statement B

• Statement C

• Statement D

Tags

CCSS.RI.7.7

CCSS.RI.8.7

CCSS.RI.9-10.7

CCSS.RL.7.7

CCSS.RL.8.7

The four smudges hide four of the numbers 1, 2, 3, 4, 5. The calculations along the two arrows are correct. Which number hides behind the smudge with the star?

• 2

• 3

• 4

• 5

Tags

CCSS.7.NS.A.3

The five balls weigh 30 g, 50 g, 50 g, 50 g and 80 g. Which of the balls weighs 30 g?

• A

• B

• C

• D

Tags

CCSS.3.MD.A.2

The sum of the dots on opposite sides of an ordinary die is 7. Which of the following dice could be an ordinary die?

• 
• 
• 
• 

Tags

CCSS.2.OA.A.1

On each of the three separate pieces of paper there is a three-digit number. The sum of the three numbers is 826. What is the sum of the two hidden digits?

• 7

• 8

• 9

• 10

Tags

CCSS.2.NBT.B.7

Which of the five squares has the biggest proportion of black area? 

• 
• 
• 
• 

Tags

CCSS.4.NF.A.1

CCSS.5.NF.B.5B