Addition or Subtraction
Rounding
Multiplication
Mental Calculations
Estimate or Multiply with a 2-digit or 3-digit Factor
10

    368,254

+  221,567


What is   589,821 ?

10

437,228  rounded to the ten thousands place


What is 440,000?

10

3 x 8 

What is 24  ?

10

30 x 40 = 

700          7,000          1,200

What is  1,200?

10

Estimate of 4 x 345 = 

What is 1200 ?


20

   509,681

- 254,323


What is  255,358  ?

20

726,853  rounded to the hundred thousands place

What is 700,000?

20

4 x 9 

What is 36 ?

20

4 x  50  =  

20          90          200

200


20

Estimate of 5 x 648 =

What is 3,000 ?

30

203,458  +  197,124

What is   400,582  ?

30

851,678 rounded to the one thousands

What is 852,000 ?

30

***** Holly Jolly Word Problem***** 

The store sold 5 times as many candy canes in December than it sold in November.  The store sold 46 boxes of candy canes in November.  How many boxes did it sell in December?


What is 230 boxes  ?

30

1,500 + 400  = 

1,900         5,500         1,540

What is 1,900  ?

30

43 x 35 = 


What is 1505?

40

***** Holly Jolly Word Problem *******

The refreshment stand sold 89 hot chocolates on Saturday.  It sold 36 more hot chocolates on Sunday than it had on Saturday.  How many hot chocolates did it sell on Saturday and Sunday in all?

What is  214 hot chocolates?

40

516,251  rounded to the ten thousands place

What is  520,000  ?

40

***** Holly Jolly Word Problem***** 

The store sold 6 times as many candy canes in December than it sold in November.  The store sold 7 boxes of candy canes in November.  How many boxes did it sell in December?

What is 42 boxes?

40

3,200 + 1,200  = 

3,400          4,400         4,200

3,400

40

5 x 648 = 

What is  3240 ?

50

   678,518

- 239,319

What is  439,199  ?

50

671,479  rounded to the one thousands place

What is 671,000  ?

50

***** Holly Jolly Word Problem***** 

The shop sold 63 sugar cookies on Monday and Tuesday.  It sold 56 cookies on Tuesday, which was 8 times as many as the shop sold on Monday.  How many sugar cookies did it sell the shop sell on Monday?

What is 7 sugar cookies ?

50

***** Holly Jolly Word Problem *****

The on-line mitten store sold 624 pairs of mittens in November and 824 pairs of mittens in December.  How many more pairs of mittens did it sell in December than in November? 

What is 200  ?

50

64 x 98 = 

What is  6,272 ?

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