FORMULA SHEET
Unit 10 Mass Comparing the mass of 2 objects When 2 objects of different masses are placed on a balance, the object that sinks is heavier.
Number patterns When completing number patterns, • see if the number pattern is in an increasing or a decreasing order. • observe the difference between each number. • add or subtract to get the next number.
When 2 objects of different masses are placed on a balance, the object that rises is lighter.
Number order When arranging numbers in order, determine if the series starts with the smallest or the largest number.
When both sides of the balance are equal in height, the objects have the same mass. To find the mass of an object, look at the number of units needed to balance the mass of the object.
Comparing numbers The words greater than and more than mean addition (+). The words smaller than and less than mean subtraction (–). The word is means equal to (=).
Unit 11 Picture Graphs To create a picture graph, • collect data. • organize and place the data in a table.
Example: is 3 more than 19. = 3 + 19
You can read and use the picture graph to answer questions. Note that the symbol used in the picture graph stands for 1 item.
Adding numbers • Add the digits in the ones place first. • If the answer is more than 9, regroup the ones and carry a one to the tens place. • Add the digits in the tens place. Remember to add the one that was carried if there is one.
Unit 12 Numbers 1-40 Numerals
Words
Numerals
Words
21
twenty-one
31
thirty-one
22
twenty-two
32
thirty-two
23
twenty-three
33
thirty-three
24
twenty-four
34
thirty-four
25
twenty-five
35
thirty-five
26
twenty-six
36
thirty-six
27
twenty-seven
37
thirty-seven
28
twenty-eight
38
thirty-eight
29
twenty-nine
39
thirty-nine
30
thirty
40
forty
Subtracting numbers • Subtract the digits in the ones place first. • If subtraction is not possible in the ones place, regroup the tens and lend a ten (10) to the ones. • Subtract the digits in the ones place. • Then, subtract the digits in the tens place. Adding 3 numbers • Make a ten first. • Add the remaining numbers to get a sum. • Add the ten to the sum to get the final answer.
Place value Numbers greater than 10 can be grouped into tens and ones.
Unit 13 Mental Calculations Adding a 2-digit number and a 1-digit number mentally
Example: 35 = 3 tens 5 ones
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CD-704679 SINGAPORE MATH Bindup 1AB TXT.indd 124
Singapore Math Level 1A & 1B
10/21/14 2:22 PM
